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19#include <linux/fs.h>
20#include <linux/blkdev.h>
21#include <linux/scatterlist.h>
22#include <linux/swap.h>
23#include <linux/radix-tree.h>
24#include <linux/writeback.h>
25#include <linux/buffer_head.h>
26#include <linux/workqueue.h>
27#include <linux/kthread.h>
28#include <linux/freezer.h>
29#include <linux/crc32c.h>
30#include <linux/slab.h>
31#include <linux/migrate.h>
32#include <linux/ratelimit.h>
33#include <linux/uuid.h>
34#include <linux/semaphore.h>
35#include <asm/unaligned.h>
36#include "ctree.h"
37#include "disk-io.h"
38#include "transaction.h"
39#include "btrfs_inode.h"
40#include "volumes.h"
41#include "print-tree.h"
42#include "async-thread.h"
43#include "locking.h"
44#include "tree-log.h"
45#include "free-space-cache.h"
46#include "inode-map.h"
47#include "check-integrity.h"
48#include "rcu-string.h"
49#include "dev-replace.h"
50#include "raid56.h"
51
52#ifdef CONFIG_X86
53#include <asm/cpufeature.h>
54#endif
55
56static struct extent_io_ops btree_extent_io_ops;
57static void end_workqueue_fn(struct btrfs_work *work);
58static void free_fs_root(struct btrfs_root *root);
59static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
60 int read_only);
61static void btrfs_destroy_ordered_operations(struct btrfs_transaction *t,
62 struct btrfs_root *root);
63static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
64static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
65 struct btrfs_root *root);
66static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
67static int btrfs_destroy_marked_extents(struct btrfs_root *root,
68 struct extent_io_tree *dirty_pages,
69 int mark);
70static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
71 struct extent_io_tree *pinned_extents);
72static int btrfs_cleanup_transaction(struct btrfs_root *root);
73static void btrfs_error_commit_super(struct btrfs_root *root);
74
75
76
77
78
79
80struct end_io_wq {
81 struct bio *bio;
82 bio_end_io_t *end_io;
83 void *private;
84 struct btrfs_fs_info *info;
85 int error;
86 int metadata;
87 struct list_head list;
88 struct btrfs_work work;
89};
90
91
92
93
94
95
96struct async_submit_bio {
97 struct inode *inode;
98 struct bio *bio;
99 struct list_head list;
100 extent_submit_bio_hook_t *submit_bio_start;
101 extent_submit_bio_hook_t *submit_bio_done;
102 int rw;
103 int mirror_num;
104 unsigned long bio_flags;
105
106
107
108
109 u64 bio_offset;
110 struct btrfs_work work;
111 int error;
112};
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136
137#ifdef CONFIG_DEBUG_LOCK_ALLOC
138# if BTRFS_MAX_LEVEL != 8
139# error
140# endif
141
142static struct btrfs_lockdep_keyset {
143 u64 id;
144 const char *name_stem;
145 char names[BTRFS_MAX_LEVEL + 1][20];
146 struct lock_class_key keys[BTRFS_MAX_LEVEL + 1];
147} btrfs_lockdep_keysets[] = {
148 { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" },
149 { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" },
150 { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" },
151 { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" },
152 { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" },
153 { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" },
154 { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" },
155 { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" },
156 { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" },
157 { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" },
158 { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" },
159 { .id = 0, .name_stem = "tree" },
160};
161
162void __init btrfs_init_lockdep(void)
163{
164 int i, j;
165
166
167 for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) {
168 struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i];
169
170 for (j = 0; j < ARRAY_SIZE(ks->names); j++)
171 snprintf(ks->names[j], sizeof(ks->names[j]),
172 "btrfs-%s-%02d", ks->name_stem, j);
173 }
174}
175
176void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
177 int level)
178{
179 struct btrfs_lockdep_keyset *ks;
180
181 BUG_ON(level >= ARRAY_SIZE(ks->keys));
182
183
184 for (ks = btrfs_lockdep_keysets; ks->id; ks++)
185 if (ks->id == objectid)
186 break;
187
188 lockdep_set_class_and_name(&eb->lock,
189 &ks->keys[level], ks->names[level]);
190}
191
192#endif
193
194
195
196
197
198static struct extent_map *btree_get_extent(struct inode *inode,
199 struct page *page, size_t pg_offset, u64 start, u64 len,
200 int create)
201{
202 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
203 struct extent_map *em;
204 int ret;
205
206 read_lock(&em_tree->lock);
207 em = lookup_extent_mapping(em_tree, start, len);
208 if (em) {
209 em->bdev =
210 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
211 read_unlock(&em_tree->lock);
212 goto out;
213 }
214 read_unlock(&em_tree->lock);
215
216 em = alloc_extent_map();
217 if (!em) {
218 em = ERR_PTR(-ENOMEM);
219 goto out;
220 }
221 em->start = 0;
222 em->len = (u64)-1;
223 em->block_len = (u64)-1;
224 em->block_start = 0;
225 em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
226
227 write_lock(&em_tree->lock);
228 ret = add_extent_mapping(em_tree, em, 0);
229 if (ret == -EEXIST) {
230 free_extent_map(em);
231 em = lookup_extent_mapping(em_tree, start, len);
232 if (!em)
233 em = ERR_PTR(-EIO);
234 } else if (ret) {
235 free_extent_map(em);
236 em = ERR_PTR(ret);
237 }
238 write_unlock(&em_tree->lock);
239
240out:
241 return em;
242}
243
244u32 btrfs_csum_data(char *data, u32 seed, size_t len)
245{
246 return crc32c(seed, data, len);
247}
248
249void btrfs_csum_final(u32 crc, char *result)
250{
251 put_unaligned_le32(~crc, result);
252}
253
254
255
256
257
258static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
259 int verify)
260{
261 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
262 char *result = NULL;
263 unsigned long len;
264 unsigned long cur_len;
265 unsigned long offset = BTRFS_CSUM_SIZE;
266 char *kaddr;
267 unsigned long map_start;
268 unsigned long map_len;
269 int err;
270 u32 crc = ~(u32)0;
271 unsigned long inline_result;
272
273 len = buf->len - offset;
274 while (len > 0) {
275 err = map_private_extent_buffer(buf, offset, 32,
276 &kaddr, &map_start, &map_len);
277 if (err)
278 return 1;
279 cur_len = min(len, map_len - (offset - map_start));
280 crc = btrfs_csum_data(kaddr + offset - map_start,
281 crc, cur_len);
282 len -= cur_len;
283 offset += cur_len;
284 }
285 if (csum_size > sizeof(inline_result)) {
286 result = kzalloc(csum_size * sizeof(char), GFP_NOFS);
287 if (!result)
288 return 1;
289 } else {
290 result = (char *)&inline_result;
291 }
292
293 btrfs_csum_final(crc, result);
294
295 if (verify) {
296 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
297 u32 val;
298 u32 found = 0;
299 memcpy(&found, result, csum_size);
300
301 read_extent_buffer(buf, &val, 0, csum_size);
302 printk_ratelimited(KERN_INFO "btrfs: %s checksum verify "
303 "failed on %llu wanted %X found %X "
304 "level %d\n",
305 root->fs_info->sb->s_id, buf->start,
306 val, found, btrfs_header_level(buf));
307 if (result != (char *)&inline_result)
308 kfree(result);
309 return 1;
310 }
311 } else {
312 write_extent_buffer(buf, result, 0, csum_size);
313 }
314 if (result != (char *)&inline_result)
315 kfree(result);
316 return 0;
317}
318
319
320
321
322
323
324
325static int verify_parent_transid(struct extent_io_tree *io_tree,
326 struct extent_buffer *eb, u64 parent_transid,
327 int atomic)
328{
329 struct extent_state *cached_state = NULL;
330 int ret;
331
332 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
333 return 0;
334
335 if (atomic)
336 return -EAGAIN;
337
338 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
339 0, &cached_state);
340 if (extent_buffer_uptodate(eb) &&
341 btrfs_header_generation(eb) == parent_transid) {
342 ret = 0;
343 goto out;
344 }
345 printk_ratelimited("parent transid verify failed on %llu wanted %llu "
346 "found %llu\n",
347 eb->start, parent_transid, btrfs_header_generation(eb));
348 ret = 1;
349 clear_extent_buffer_uptodate(eb);
350out:
351 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
352 &cached_state, GFP_NOFS);
353 return ret;
354}
355
356
357
358
359
360static int btrfs_check_super_csum(char *raw_disk_sb)
361{
362 struct btrfs_super_block *disk_sb =
363 (struct btrfs_super_block *)raw_disk_sb;
364 u16 csum_type = btrfs_super_csum_type(disk_sb);
365 int ret = 0;
366
367 if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
368 u32 crc = ~(u32)0;
369 const int csum_size = sizeof(crc);
370 char result[csum_size];
371
372
373
374
375
376
377 crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE,
378 crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
379 btrfs_csum_final(crc, result);
380
381 if (memcmp(raw_disk_sb, result, csum_size))
382 ret = 1;
383
384 if (ret && btrfs_super_generation(disk_sb) < 10) {
385 printk(KERN_WARNING "btrfs: super block crcs don't match, older mkfs detected\n");
386 ret = 0;
387 }
388 }
389
390 if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
391 printk(KERN_ERR "btrfs: unsupported checksum algorithm %u\n",
392 csum_type);
393 ret = 1;
394 }
395
396 return ret;
397}
398
399
400
401
402
403static int btree_read_extent_buffer_pages(struct btrfs_root *root,
404 struct extent_buffer *eb,
405 u64 start, u64 parent_transid)
406{
407 struct extent_io_tree *io_tree;
408 int failed = 0;
409 int ret;
410 int num_copies = 0;
411 int mirror_num = 0;
412 int failed_mirror = 0;
413
414 clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
415 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
416 while (1) {
417 ret = read_extent_buffer_pages(io_tree, eb, start,
418 WAIT_COMPLETE,
419 btree_get_extent, mirror_num);
420 if (!ret) {
421 if (!verify_parent_transid(io_tree, eb,
422 parent_transid, 0))
423 break;
424 else
425 ret = -EIO;
426 }
427
428
429
430
431
432
433 if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags))
434 break;
435
436 num_copies = btrfs_num_copies(root->fs_info,
437 eb->start, eb->len);
438 if (num_copies == 1)
439 break;
440
441 if (!failed_mirror) {
442 failed = 1;
443 failed_mirror = eb->read_mirror;
444 }
445
446 mirror_num++;
447 if (mirror_num == failed_mirror)
448 mirror_num++;
449
450 if (mirror_num > num_copies)
451 break;
452 }
453
454 if (failed && !ret && failed_mirror)
455 repair_eb_io_failure(root, eb, failed_mirror);
456
457 return ret;
458}
459
460
461
462
463
464
465static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
466{
467 struct extent_io_tree *tree;
468 u64 start = page_offset(page);
469 u64 found_start;
470 struct extent_buffer *eb;
471
472 tree = &BTRFS_I(page->mapping->host)->io_tree;
473
474 eb = (struct extent_buffer *)page->private;
475 if (page != eb->pages[0])
476 return 0;
477 found_start = btrfs_header_bytenr(eb);
478 if (WARN_ON(found_start != start || !PageUptodate(page)))
479 return 0;
480 csum_tree_block(root, eb, 0);
481 return 0;
482}
483
484static int check_tree_block_fsid(struct btrfs_root *root,
485 struct extent_buffer *eb)
486{
487 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
488 u8 fsid[BTRFS_UUID_SIZE];
489 int ret = 1;
490
491 read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
492 while (fs_devices) {
493 if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
494 ret = 0;
495 break;
496 }
497 fs_devices = fs_devices->seed;
498 }
499 return ret;
500}
501
502#define CORRUPT(reason, eb, root, slot) \
503 printk(KERN_CRIT "btrfs: corrupt leaf, %s: block=%llu," \
504 "root=%llu, slot=%d\n", reason, \
505 btrfs_header_bytenr(eb), root->objectid, slot)
506
507static noinline int check_leaf(struct btrfs_root *root,
508 struct extent_buffer *leaf)
509{
510 struct btrfs_key key;
511 struct btrfs_key leaf_key;
512 u32 nritems = btrfs_header_nritems(leaf);
513 int slot;
514
515 if (nritems == 0)
516 return 0;
517
518
519 if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) !=
520 BTRFS_LEAF_DATA_SIZE(root)) {
521 CORRUPT("invalid item offset size pair", leaf, root, 0);
522 return -EIO;
523 }
524
525
526
527
528
529
530
531
532 for (slot = 0; slot < nritems - 1; slot++) {
533 btrfs_item_key_to_cpu(leaf, &leaf_key, slot);
534 btrfs_item_key_to_cpu(leaf, &key, slot + 1);
535
536
537 if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) {
538 CORRUPT("bad key order", leaf, root, slot);
539 return -EIO;
540 }
541
542
543
544
545
546
547 if (btrfs_item_offset_nr(leaf, slot) !=
548 btrfs_item_end_nr(leaf, slot + 1)) {
549 CORRUPT("slot offset bad", leaf, root, slot);
550 return -EIO;
551 }
552
553
554
555
556
557
558 if (btrfs_item_end_nr(leaf, slot) >
559 BTRFS_LEAF_DATA_SIZE(root)) {
560 CORRUPT("slot end outside of leaf", leaf, root, slot);
561 return -EIO;
562 }
563 }
564
565 return 0;
566}
567
568static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
569 u64 phy_offset, struct page *page,
570 u64 start, u64 end, int mirror)
571{
572 struct extent_io_tree *tree;
573 u64 found_start;
574 int found_level;
575 struct extent_buffer *eb;
576 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
577 int ret = 0;
578 int reads_done;
579
580 if (!page->private)
581 goto out;
582
583 tree = &BTRFS_I(page->mapping->host)->io_tree;
584 eb = (struct extent_buffer *)page->private;
585
586
587
588
589 extent_buffer_get(eb);
590
591 reads_done = atomic_dec_and_test(&eb->io_pages);
592 if (!reads_done)
593 goto err;
594
595 eb->read_mirror = mirror;
596 if (test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) {
597 ret = -EIO;
598 goto err;
599 }
600
601 found_start = btrfs_header_bytenr(eb);
602 if (found_start != eb->start) {
603 printk_ratelimited(KERN_INFO "btrfs bad tree block start "
604 "%llu %llu\n",
605 found_start, eb->start);
606 ret = -EIO;
607 goto err;
608 }
609 if (check_tree_block_fsid(root, eb)) {
610 printk_ratelimited(KERN_INFO "btrfs bad fsid on block %llu\n",
611 eb->start);
612 ret = -EIO;
613 goto err;
614 }
615 found_level = btrfs_header_level(eb);
616 if (found_level >= BTRFS_MAX_LEVEL) {
617 btrfs_info(root->fs_info, "bad tree block level %d\n",
618 (int)btrfs_header_level(eb));
619 ret = -EIO;
620 goto err;
621 }
622
623 btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
624 eb, found_level);
625
626 ret = csum_tree_block(root, eb, 1);
627 if (ret) {
628 ret = -EIO;
629 goto err;
630 }
631
632
633
634
635
636
637 if (found_level == 0 && check_leaf(root, eb)) {
638 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
639 ret = -EIO;
640 }
641
642 if (!ret)
643 set_extent_buffer_uptodate(eb);
644err:
645 if (reads_done &&
646 test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
647 btree_readahead_hook(root, eb, eb->start, ret);
648
649 if (ret) {
650
651
652
653
654
655 atomic_inc(&eb->io_pages);
656 clear_extent_buffer_uptodate(eb);
657 }
658 free_extent_buffer(eb);
659out:
660 return ret;
661}
662
663static int btree_io_failed_hook(struct page *page, int failed_mirror)
664{
665 struct extent_buffer *eb;
666 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
667
668 eb = (struct extent_buffer *)page->private;
669 set_bit(EXTENT_BUFFER_IOERR, &eb->bflags);
670 eb->read_mirror = failed_mirror;
671 atomic_dec(&eb->io_pages);
672 if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
673 btree_readahead_hook(root, eb, eb->start, -EIO);
674 return -EIO;
675}
676
677static void end_workqueue_bio(struct bio *bio, int err)
678{
679 struct end_io_wq *end_io_wq = bio->bi_private;
680 struct btrfs_fs_info *fs_info;
681
682 fs_info = end_io_wq->info;
683 end_io_wq->error = err;
684 end_io_wq->work.func = end_workqueue_fn;
685 end_io_wq->work.flags = 0;
686
687 if (bio->bi_rw & REQ_WRITE) {
688 if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA)
689 btrfs_queue_worker(&fs_info->endio_meta_write_workers,
690 &end_io_wq->work);
691 else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE)
692 btrfs_queue_worker(&fs_info->endio_freespace_worker,
693 &end_io_wq->work);
694 else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
695 btrfs_queue_worker(&fs_info->endio_raid56_workers,
696 &end_io_wq->work);
697 else
698 btrfs_queue_worker(&fs_info->endio_write_workers,
699 &end_io_wq->work);
700 } else {
701 if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
702 btrfs_queue_worker(&fs_info->endio_raid56_workers,
703 &end_io_wq->work);
704 else if (end_io_wq->metadata)
705 btrfs_queue_worker(&fs_info->endio_meta_workers,
706 &end_io_wq->work);
707 else
708 btrfs_queue_worker(&fs_info->endio_workers,
709 &end_io_wq->work);
710 }
711}
712
713
714
715
716
717
718
719
720
721int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
722 int metadata)
723{
724 struct end_io_wq *end_io_wq;
725 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
726 if (!end_io_wq)
727 return -ENOMEM;
728
729 end_io_wq->private = bio->bi_private;
730 end_io_wq->end_io = bio->bi_end_io;
731 end_io_wq->info = info;
732 end_io_wq->error = 0;
733 end_io_wq->bio = bio;
734 end_io_wq->metadata = metadata;
735
736 bio->bi_private = end_io_wq;
737 bio->bi_end_io = end_workqueue_bio;
738 return 0;
739}
740
741unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
742{
743 unsigned long limit = min_t(unsigned long,
744 info->workers.max_workers,
745 info->fs_devices->open_devices);
746 return 256 * limit;
747}
748
749static void run_one_async_start(struct btrfs_work *work)
750{
751 struct async_submit_bio *async;
752 int ret;
753
754 async = container_of(work, struct async_submit_bio, work);
755 ret = async->submit_bio_start(async->inode, async->rw, async->bio,
756 async->mirror_num, async->bio_flags,
757 async->bio_offset);
758 if (ret)
759 async->error = ret;
760}
761
762static void run_one_async_done(struct btrfs_work *work)
763{
764 struct btrfs_fs_info *fs_info;
765 struct async_submit_bio *async;
766 int limit;
767
768 async = container_of(work, struct async_submit_bio, work);
769 fs_info = BTRFS_I(async->inode)->root->fs_info;
770
771 limit = btrfs_async_submit_limit(fs_info);
772 limit = limit * 2 / 3;
773
774 if (atomic_dec_return(&fs_info->nr_async_submits) < limit &&
775 waitqueue_active(&fs_info->async_submit_wait))
776 wake_up(&fs_info->async_submit_wait);
777
778
779 if (async->error) {
780 bio_endio(async->bio, async->error);
781 return;
782 }
783
784 async->submit_bio_done(async->inode, async->rw, async->bio,
785 async->mirror_num, async->bio_flags,
786 async->bio_offset);
787}
788
789static void run_one_async_free(struct btrfs_work *work)
790{
791 struct async_submit_bio *async;
792
793 async = container_of(work, struct async_submit_bio, work);
794 kfree(async);
795}
796
797int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
798 int rw, struct bio *bio, int mirror_num,
799 unsigned long bio_flags,
800 u64 bio_offset,
801 extent_submit_bio_hook_t *submit_bio_start,
802 extent_submit_bio_hook_t *submit_bio_done)
803{
804 struct async_submit_bio *async;
805
806 async = kmalloc(sizeof(*async), GFP_NOFS);
807 if (!async)
808 return -ENOMEM;
809
810 async->inode = inode;
811 async->rw = rw;
812 async->bio = bio;
813 async->mirror_num = mirror_num;
814 async->submit_bio_start = submit_bio_start;
815 async->submit_bio_done = submit_bio_done;
816
817 async->work.func = run_one_async_start;
818 async->work.ordered_func = run_one_async_done;
819 async->work.ordered_free = run_one_async_free;
820
821 async->work.flags = 0;
822 async->bio_flags = bio_flags;
823 async->bio_offset = bio_offset;
824
825 async->error = 0;
826
827 atomic_inc(&fs_info->nr_async_submits);
828
829 if (rw & REQ_SYNC)
830 btrfs_set_work_high_prio(&async->work);
831
832 btrfs_queue_worker(&fs_info->workers, &async->work);
833
834 while (atomic_read(&fs_info->async_submit_draining) &&
835 atomic_read(&fs_info->nr_async_submits)) {
836 wait_event(fs_info->async_submit_wait,
837 (atomic_read(&fs_info->nr_async_submits) == 0));
838 }
839
840 return 0;
841}
842
843static int btree_csum_one_bio(struct bio *bio)
844{
845 struct bio_vec *bvec = bio->bi_io_vec;
846 int bio_index = 0;
847 struct btrfs_root *root;
848 int ret = 0;
849
850 WARN_ON(bio->bi_vcnt <= 0);
851 while (bio_index < bio->bi_vcnt) {
852 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
853 ret = csum_dirty_buffer(root, bvec->bv_page);
854 if (ret)
855 break;
856 bio_index++;
857 bvec++;
858 }
859 return ret;
860}
861
862static int __btree_submit_bio_start(struct inode *inode, int rw,
863 struct bio *bio, int mirror_num,
864 unsigned long bio_flags,
865 u64 bio_offset)
866{
867
868
869
870
871 return btree_csum_one_bio(bio);
872}
873
874static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
875 int mirror_num, unsigned long bio_flags,
876 u64 bio_offset)
877{
878 int ret;
879
880
881
882
883
884 ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
885 if (ret)
886 bio_endio(bio, ret);
887 return ret;
888}
889
890static int check_async_write(struct inode *inode, unsigned long bio_flags)
891{
892 if (bio_flags & EXTENT_BIO_TREE_LOG)
893 return 0;
894#ifdef CONFIG_X86
895 if (cpu_has_xmm4_2)
896 return 0;
897#endif
898 return 1;
899}
900
901static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
902 int mirror_num, unsigned long bio_flags,
903 u64 bio_offset)
904{
905 int async = check_async_write(inode, bio_flags);
906 int ret;
907
908 if (!(rw & REQ_WRITE)) {
909
910
911
912
913 ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
914 bio, 1);
915 if (ret)
916 goto out_w_error;
917 ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
918 mirror_num, 0);
919 } else if (!async) {
920 ret = btree_csum_one_bio(bio);
921 if (ret)
922 goto out_w_error;
923 ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
924 mirror_num, 0);
925 } else {
926
927
928
929
930 ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
931 inode, rw, bio, mirror_num, 0,
932 bio_offset,
933 __btree_submit_bio_start,
934 __btree_submit_bio_done);
935 }
936
937 if (ret) {
938out_w_error:
939 bio_endio(bio, ret);
940 }
941 return ret;
942}
943
944#ifdef CONFIG_MIGRATION
945static int btree_migratepage(struct address_space *mapping,
946 struct page *newpage, struct page *page,
947 enum migrate_mode mode)
948{
949
950
951
952
953 if (PageDirty(page))
954 return -EAGAIN;
955
956
957
958
959 if (page_has_private(page) &&
960 !try_to_release_page(page, GFP_KERNEL))
961 return -EAGAIN;
962 return migrate_page(mapping, newpage, page, mode);
963}
964#endif
965
966
967static int btree_writepages(struct address_space *mapping,
968 struct writeback_control *wbc)
969{
970 struct extent_io_tree *tree;
971 struct btrfs_fs_info *fs_info;
972 int ret;
973
974 tree = &BTRFS_I(mapping->host)->io_tree;
975 if (wbc->sync_mode == WB_SYNC_NONE) {
976
977 if (wbc->for_kupdate)
978 return 0;
979
980 fs_info = BTRFS_I(mapping->host)->root->fs_info;
981
982 ret = percpu_counter_compare(&fs_info->dirty_metadata_bytes,
983 BTRFS_DIRTY_METADATA_THRESH);
984 if (ret < 0)
985 return 0;
986 }
987 return btree_write_cache_pages(mapping, wbc);
988}
989
990static int btree_readpage(struct file *file, struct page *page)
991{
992 struct extent_io_tree *tree;
993 tree = &BTRFS_I(page->mapping->host)->io_tree;
994 return extent_read_full_page(tree, page, btree_get_extent, 0);
995}
996
997static int btree_releasepage(struct page *page, gfp_t gfp_flags)
998{
999 if (PageWriteback(page) || PageDirty(page))
1000 return 0;
1001
1002 return try_release_extent_buffer(page);
1003}
1004
1005static void btree_invalidatepage(struct page *page, unsigned int offset,
1006 unsigned int length)
1007{
1008 struct extent_io_tree *tree;
1009 tree = &BTRFS_I(page->mapping->host)->io_tree;
1010 extent_invalidatepage(tree, page, offset);
1011 btree_releasepage(page, GFP_NOFS);
1012 if (PagePrivate(page)) {
1013 printk(KERN_WARNING "btrfs warning page private not zero "
1014 "on page %llu\n", (unsigned long long)page_offset(page));
1015 ClearPagePrivate(page);
1016 set_page_private(page, 0);
1017 page_cache_release(page);
1018 }
1019}
1020
1021static int btree_set_page_dirty(struct page *page)
1022{
1023#ifdef DEBUG
1024 struct extent_buffer *eb;
1025
1026 BUG_ON(!PagePrivate(page));
1027 eb = (struct extent_buffer *)page->private;
1028 BUG_ON(!eb);
1029 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
1030 BUG_ON(!atomic_read(&eb->refs));
1031 btrfs_assert_tree_locked(eb);
1032#endif
1033 return __set_page_dirty_nobuffers(page);
1034}
1035
1036static const struct address_space_operations btree_aops = {
1037 .readpage = btree_readpage,
1038 .writepages = btree_writepages,
1039 .releasepage = btree_releasepage,
1040 .invalidatepage = btree_invalidatepage,
1041#ifdef CONFIG_MIGRATION
1042 .migratepage = btree_migratepage,
1043#endif
1044 .set_page_dirty = btree_set_page_dirty,
1045};
1046
1047int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
1048 u64 parent_transid)
1049{
1050 struct extent_buffer *buf = NULL;
1051 struct inode *btree_inode = root->fs_info->btree_inode;
1052 int ret = 0;
1053
1054 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
1055 if (!buf)
1056 return 0;
1057 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
1058 buf, 0, WAIT_NONE, btree_get_extent, 0);
1059 free_extent_buffer(buf);
1060 return ret;
1061}
1062
1063int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
1064 int mirror_num, struct extent_buffer **eb)
1065{
1066 struct extent_buffer *buf = NULL;
1067 struct inode *btree_inode = root->fs_info->btree_inode;
1068 struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree;
1069 int ret;
1070
1071 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
1072 if (!buf)
1073 return 0;
1074
1075 set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);
1076
1077 ret = read_extent_buffer_pages(io_tree, buf, 0, WAIT_PAGE_LOCK,
1078 btree_get_extent, mirror_num);
1079 if (ret) {
1080 free_extent_buffer(buf);
1081 return ret;
1082 }
1083
1084 if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
1085 free_extent_buffer(buf);
1086 return -EIO;
1087 } else if (extent_buffer_uptodate(buf)) {
1088 *eb = buf;
1089 } else {
1090 free_extent_buffer(buf);
1091 }
1092 return 0;
1093}
1094
1095struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
1096 u64 bytenr, u32 blocksize)
1097{
1098 struct inode *btree_inode = root->fs_info->btree_inode;
1099 struct extent_buffer *eb;
1100 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, bytenr);
1101 return eb;
1102}
1103
1104struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
1105 u64 bytenr, u32 blocksize)
1106{
1107 struct inode *btree_inode = root->fs_info->btree_inode;
1108 struct extent_buffer *eb;
1109
1110 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
1111 bytenr, blocksize);
1112 return eb;
1113}
1114
1115
1116int btrfs_write_tree_block(struct extent_buffer *buf)
1117{
1118 return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start,
1119 buf->start + buf->len - 1);
1120}
1121
1122int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
1123{
1124 return filemap_fdatawait_range(buf->pages[0]->mapping,
1125 buf->start, buf->start + buf->len - 1);
1126}
1127
1128struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
1129 u32 blocksize, u64 parent_transid)
1130{
1131 struct extent_buffer *buf = NULL;
1132 int ret;
1133
1134 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
1135 if (!buf)
1136 return NULL;
1137
1138 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
1139 if (ret) {
1140 free_extent_buffer(buf);
1141 return NULL;
1142 }
1143 return buf;
1144
1145}
1146
1147void clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1148 struct extent_buffer *buf)
1149{
1150 struct btrfs_fs_info *fs_info = root->fs_info;
1151
1152 if (btrfs_header_generation(buf) ==
1153 fs_info->running_transaction->transid) {
1154 btrfs_assert_tree_locked(buf);
1155
1156 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
1157 __percpu_counter_add(&fs_info->dirty_metadata_bytes,
1158 -buf->len,
1159 fs_info->dirty_metadata_batch);
1160
1161 btrfs_set_lock_blocking(buf);
1162 clear_extent_buffer_dirty(buf);
1163 }
1164 }
1165}
1166
1167static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
1168 u32 stripesize, struct btrfs_root *root,
1169 struct btrfs_fs_info *fs_info,
1170 u64 objectid)
1171{
1172 root->node = NULL;
1173 root->commit_root = NULL;
1174 root->sectorsize = sectorsize;
1175 root->nodesize = nodesize;
1176 root->leafsize = leafsize;
1177 root->stripesize = stripesize;
1178 root->ref_cows = 0;
1179 root->track_dirty = 0;
1180 root->in_radix = 0;
1181 root->orphan_item_inserted = 0;
1182 root->orphan_cleanup_state = 0;
1183
1184 root->objectid = objectid;
1185 root->last_trans = 0;
1186 root->highest_objectid = 0;
1187 root->nr_delalloc_inodes = 0;
1188 root->nr_ordered_extents = 0;
1189 root->name = NULL;
1190 root->inode_tree = RB_ROOT;
1191 INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
1192 root->block_rsv = NULL;
1193 root->orphan_block_rsv = NULL;
1194
1195 INIT_LIST_HEAD(&root->dirty_list);
1196 INIT_LIST_HEAD(&root->root_list);
1197 INIT_LIST_HEAD(&root->delalloc_inodes);
1198 INIT_LIST_HEAD(&root->delalloc_root);
1199 INIT_LIST_HEAD(&root->ordered_extents);
1200 INIT_LIST_HEAD(&root->ordered_root);
1201 INIT_LIST_HEAD(&root->logged_list[0]);
1202 INIT_LIST_HEAD(&root->logged_list[1]);
1203 spin_lock_init(&root->orphan_lock);
1204 spin_lock_init(&root->inode_lock);
1205 spin_lock_init(&root->delalloc_lock);
1206 spin_lock_init(&root->ordered_extent_lock);
1207 spin_lock_init(&root->accounting_lock);
1208 spin_lock_init(&root->log_extents_lock[0]);
1209 spin_lock_init(&root->log_extents_lock[1]);
1210 mutex_init(&root->objectid_mutex);
1211 mutex_init(&root->log_mutex);
1212 init_waitqueue_head(&root->log_writer_wait);
1213 init_waitqueue_head(&root->log_commit_wait[0]);
1214 init_waitqueue_head(&root->log_commit_wait[1]);
1215 atomic_set(&root->log_commit[0], 0);
1216 atomic_set(&root->log_commit[1], 0);
1217 atomic_set(&root->log_writers, 0);
1218 atomic_set(&root->log_batch, 0);
1219 atomic_set(&root->orphan_inodes, 0);
1220 atomic_set(&root->refs, 1);
1221 root->log_transid = 0;
1222 root->last_log_commit = 0;
1223 if (fs_info)
1224 extent_io_tree_init(&root->dirty_log_pages,
1225 fs_info->btree_inode->i_mapping);
1226
1227 memset(&root->root_key, 0, sizeof(root->root_key));
1228 memset(&root->root_item, 0, sizeof(root->root_item));
1229 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
1230 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
1231 if (fs_info)
1232 root->defrag_trans_start = fs_info->generation;
1233 else
1234 root->defrag_trans_start = 0;
1235 init_completion(&root->kobj_unregister);
1236 root->defrag_running = 0;
1237 root->root_key.objectid = objectid;
1238 root->anon_dev = 0;
1239
1240 spin_lock_init(&root->root_item_lock);
1241}
1242
1243static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info)
1244{
1245 struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS);
1246 if (root)
1247 root->fs_info = fs_info;
1248 return root;
1249}
1250
1251#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1252
1253struct btrfs_root *btrfs_alloc_dummy_root(void)
1254{
1255 struct btrfs_root *root;
1256
1257 root = btrfs_alloc_root(NULL);
1258 if (!root)
1259 return ERR_PTR(-ENOMEM);
1260 __setup_root(4096, 4096, 4096, 4096, root, NULL, 1);
1261 root->dummy_root = 1;
1262
1263 return root;
1264}
1265#endif
1266
1267struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
1268 struct btrfs_fs_info *fs_info,
1269 u64 objectid)
1270{
1271 struct extent_buffer *leaf;
1272 struct btrfs_root *tree_root = fs_info->tree_root;
1273 struct btrfs_root *root;
1274 struct btrfs_key key;
1275 int ret = 0;
1276 u64 bytenr;
1277 uuid_le uuid;
1278
1279 root = btrfs_alloc_root(fs_info);
1280 if (!root)
1281 return ERR_PTR(-ENOMEM);
1282
1283 __setup_root(tree_root->nodesize, tree_root->leafsize,
1284 tree_root->sectorsize, tree_root->stripesize,
1285 root, fs_info, objectid);
1286 root->root_key.objectid = objectid;
1287 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1288 root->root_key.offset = 0;
1289
1290 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
1291 0, objectid, NULL, 0, 0, 0);
1292 if (IS_ERR(leaf)) {
1293 ret = PTR_ERR(leaf);
1294 leaf = NULL;
1295 goto fail;
1296 }
1297
1298 bytenr = leaf->start;
1299 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
1300 btrfs_set_header_bytenr(leaf, leaf->start);
1301 btrfs_set_header_generation(leaf, trans->transid);
1302 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
1303 btrfs_set_header_owner(leaf, objectid);
1304 root->node = leaf;
1305
1306 write_extent_buffer(leaf, fs_info->fsid, btrfs_header_fsid(),
1307 BTRFS_FSID_SIZE);
1308 write_extent_buffer(leaf, fs_info->chunk_tree_uuid,
1309 btrfs_header_chunk_tree_uuid(leaf),
1310 BTRFS_UUID_SIZE);
1311 btrfs_mark_buffer_dirty(leaf);
1312
1313 root->commit_root = btrfs_root_node(root);
1314 root->track_dirty = 1;
1315
1316
1317 root->root_item.flags = 0;
1318 root->root_item.byte_limit = 0;
1319 btrfs_set_root_bytenr(&root->root_item, leaf->start);
1320 btrfs_set_root_generation(&root->root_item, trans->transid);
1321 btrfs_set_root_level(&root->root_item, 0);
1322 btrfs_set_root_refs(&root->root_item, 1);
1323 btrfs_set_root_used(&root->root_item, leaf->len);
1324 btrfs_set_root_last_snapshot(&root->root_item, 0);
1325 btrfs_set_root_dirid(&root->root_item, 0);
1326 uuid_le_gen(&uuid);
1327 memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
1328 root->root_item.drop_level = 0;
1329
1330 key.objectid = objectid;
1331 key.type = BTRFS_ROOT_ITEM_KEY;
1332 key.offset = 0;
1333 ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
1334 if (ret)
1335 goto fail;
1336
1337 btrfs_tree_unlock(leaf);
1338
1339 return root;
1340
1341fail:
1342 if (leaf) {
1343 btrfs_tree_unlock(leaf);
1344 free_extent_buffer(leaf);
1345 }
1346 kfree(root);
1347
1348 return ERR_PTR(ret);
1349}
1350
1351static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1352 struct btrfs_fs_info *fs_info)
1353{
1354 struct btrfs_root *root;
1355 struct btrfs_root *tree_root = fs_info->tree_root;
1356 struct extent_buffer *leaf;
1357
1358 root = btrfs_alloc_root(fs_info);
1359 if (!root)
1360 return ERR_PTR(-ENOMEM);
1361
1362 __setup_root(tree_root->nodesize, tree_root->leafsize,
1363 tree_root->sectorsize, tree_root->stripesize,
1364 root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1365
1366 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1367 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1368 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1369
1370
1371
1372
1373
1374
1375 root->ref_cows = 0;
1376
1377 leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
1378 BTRFS_TREE_LOG_OBJECTID, NULL,
1379 0, 0, 0);
1380 if (IS_ERR(leaf)) {
1381 kfree(root);
1382 return ERR_CAST(leaf);
1383 }
1384
1385 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
1386 btrfs_set_header_bytenr(leaf, leaf->start);
1387 btrfs_set_header_generation(leaf, trans->transid);
1388 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
1389 btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
1390 root->node = leaf;
1391
1392 write_extent_buffer(root->node, root->fs_info->fsid,
1393 btrfs_header_fsid(), BTRFS_FSID_SIZE);
1394 btrfs_mark_buffer_dirty(root->node);
1395 btrfs_tree_unlock(root->node);
1396 return root;
1397}
1398
1399int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1400 struct btrfs_fs_info *fs_info)
1401{
1402 struct btrfs_root *log_root;
1403
1404 log_root = alloc_log_tree(trans, fs_info);
1405 if (IS_ERR(log_root))
1406 return PTR_ERR(log_root);
1407 WARN_ON(fs_info->log_root_tree);
1408 fs_info->log_root_tree = log_root;
1409 return 0;
1410}
1411
1412int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1413 struct btrfs_root *root)
1414{
1415 struct btrfs_root *log_root;
1416 struct btrfs_inode_item *inode_item;
1417
1418 log_root = alloc_log_tree(trans, root->fs_info);
1419 if (IS_ERR(log_root))
1420 return PTR_ERR(log_root);
1421
1422 log_root->last_trans = trans->transid;
1423 log_root->root_key.offset = root->root_key.objectid;
1424
1425 inode_item = &log_root->root_item.inode;
1426 btrfs_set_stack_inode_generation(inode_item, 1);
1427 btrfs_set_stack_inode_size(inode_item, 3);
1428 btrfs_set_stack_inode_nlink(inode_item, 1);
1429 btrfs_set_stack_inode_nbytes(inode_item, root->leafsize);
1430 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
1431
1432 btrfs_set_root_node(&log_root->root_item, log_root->node);
1433
1434 WARN_ON(root->log_root);
1435 root->log_root = log_root;
1436 root->log_transid = 0;
1437 root->last_log_commit = 0;
1438 return 0;
1439}
1440
1441static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
1442 struct btrfs_key *key)
1443{
1444 struct btrfs_root *root;
1445 struct btrfs_fs_info *fs_info = tree_root->fs_info;
1446 struct btrfs_path *path;
1447 u64 generation;
1448 u32 blocksize;
1449 int ret;
1450
1451 path = btrfs_alloc_path();
1452 if (!path)
1453 return ERR_PTR(-ENOMEM);
1454
1455 root = btrfs_alloc_root(fs_info);
1456 if (!root) {
1457 ret = -ENOMEM;
1458 goto alloc_fail;
1459 }
1460
1461 __setup_root(tree_root->nodesize, tree_root->leafsize,
1462 tree_root->sectorsize, tree_root->stripesize,
1463 root, fs_info, key->objectid);
1464
1465 ret = btrfs_find_root(tree_root, key, path,
1466 &root->root_item, &root->root_key);
1467 if (ret) {
1468 if (ret > 0)
1469 ret = -ENOENT;
1470 goto find_fail;
1471 }
1472
1473 generation = btrfs_root_generation(&root->root_item);
1474 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
1475 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
1476 blocksize, generation);
1477 if (!root->node) {
1478 ret = -ENOMEM;
1479 goto find_fail;
1480 } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
1481 ret = -EIO;
1482 goto read_fail;
1483 }
1484 root->commit_root = btrfs_root_node(root);
1485out:
1486 btrfs_free_path(path);
1487 return root;
1488
1489read_fail:
1490 free_extent_buffer(root->node);
1491find_fail:
1492 kfree(root);
1493alloc_fail:
1494 root = ERR_PTR(ret);
1495 goto out;
1496}
1497
1498struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
1499 struct btrfs_key *location)
1500{
1501 struct btrfs_root *root;
1502
1503 root = btrfs_read_tree_root(tree_root, location);
1504 if (IS_ERR(root))
1505 return root;
1506
1507 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
1508 root->ref_cows = 1;
1509 btrfs_check_and_init_root_item(&root->root_item);
1510 }
1511
1512 return root;
1513}
1514
1515int btrfs_init_fs_root(struct btrfs_root *root)
1516{
1517 int ret;
1518
1519 root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
1520 root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
1521 GFP_NOFS);
1522 if (!root->free_ino_pinned || !root->free_ino_ctl) {
1523 ret = -ENOMEM;
1524 goto fail;
1525 }
1526
1527 btrfs_init_free_ino_ctl(root);
1528 mutex_init(&root->fs_commit_mutex);
1529 spin_lock_init(&root->cache_lock);
1530 init_waitqueue_head(&root->cache_wait);
1531
1532 ret = get_anon_bdev(&root->anon_dev);
1533 if (ret)
1534 goto fail;
1535 return 0;
1536fail:
1537 kfree(root->free_ino_ctl);
1538 kfree(root->free_ino_pinned);
1539 return ret;
1540}
1541
1542static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1543 u64 root_id)
1544{
1545 struct btrfs_root *root;
1546
1547 spin_lock(&fs_info->fs_roots_radix_lock);
1548 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1549 (unsigned long)root_id);
1550 spin_unlock(&fs_info->fs_roots_radix_lock);
1551 return root;
1552}
1553
1554int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
1555 struct btrfs_root *root)
1556{
1557 int ret;
1558
1559 ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
1560 if (ret)
1561 return ret;
1562
1563 spin_lock(&fs_info->fs_roots_radix_lock);
1564 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1565 (unsigned long)root->root_key.objectid,
1566 root);
1567 if (ret == 0)
1568 root->in_radix = 1;
1569 spin_unlock(&fs_info->fs_roots_radix_lock);
1570 radix_tree_preload_end();
1571
1572 return ret;
1573}
1574
1575struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
1576 struct btrfs_key *location,
1577 bool check_ref)
1578{
1579 struct btrfs_root *root;
1580 int ret;
1581
1582 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1583 return fs_info->tree_root;
1584 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1585 return fs_info->extent_root;
1586 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1587 return fs_info->chunk_root;
1588 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1589 return fs_info->dev_root;
1590 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1591 return fs_info->csum_root;
1592 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
1593 return fs_info->quota_root ? fs_info->quota_root :
1594 ERR_PTR(-ENOENT);
1595 if (location->objectid == BTRFS_UUID_TREE_OBJECTID)
1596 return fs_info->uuid_root ? fs_info->uuid_root :
1597 ERR_PTR(-ENOENT);
1598again:
1599 root = btrfs_lookup_fs_root(fs_info, location->objectid);
1600 if (root) {
1601 if (check_ref && btrfs_root_refs(&root->root_item) == 0)
1602 return ERR_PTR(-ENOENT);
1603 return root;
1604 }
1605
1606 root = btrfs_read_fs_root(fs_info->tree_root, location);
1607 if (IS_ERR(root))
1608 return root;
1609
1610 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1611 ret = -ENOENT;
1612 goto fail;
1613 }
1614
1615 ret = btrfs_init_fs_root(root);
1616 if (ret)
1617 goto fail;
1618
1619 ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid);
1620 if (ret < 0)
1621 goto fail;
1622 if (ret == 0)
1623 root->orphan_item_inserted = 1;
1624
1625 ret = btrfs_insert_fs_root(fs_info, root);
1626 if (ret) {
1627 if (ret == -EEXIST) {
1628 free_fs_root(root);
1629 goto again;
1630 }
1631 goto fail;
1632 }
1633 return root;
1634fail:
1635 free_fs_root(root);
1636 return ERR_PTR(ret);
1637}
1638
1639static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1640{
1641 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1642 int ret = 0;
1643 struct btrfs_device *device;
1644 struct backing_dev_info *bdi;
1645
1646 rcu_read_lock();
1647 list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
1648 if (!device->bdev)
1649 continue;
1650 bdi = blk_get_backing_dev_info(device->bdev);
1651 if (bdi && bdi_congested(bdi, bdi_bits)) {
1652 ret = 1;
1653 break;
1654 }
1655 }
1656 rcu_read_unlock();
1657 return ret;
1658}
1659
1660
1661
1662
1663
1664static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
1665{
1666 int err;
1667
1668 bdi->capabilities = BDI_CAP_MAP_COPY;
1669 err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY);
1670 if (err)
1671 return err;
1672
1673 bdi->ra_pages = default_backing_dev_info.ra_pages;
1674 bdi->congested_fn = btrfs_congested_fn;
1675 bdi->congested_data = info;
1676 return 0;
1677}
1678
1679
1680
1681
1682
1683static void end_workqueue_fn(struct btrfs_work *work)
1684{
1685 struct bio *bio;
1686 struct end_io_wq *end_io_wq;
1687 struct btrfs_fs_info *fs_info;
1688 int error;
1689
1690 end_io_wq = container_of(work, struct end_io_wq, work);
1691 bio = end_io_wq->bio;
1692 fs_info = end_io_wq->info;
1693
1694 error = end_io_wq->error;
1695 bio->bi_private = end_io_wq->private;
1696 bio->bi_end_io = end_io_wq->end_io;
1697 kfree(end_io_wq);
1698 bio_endio(bio, error);
1699}
1700
1701static int cleaner_kthread(void *arg)
1702{
1703 struct btrfs_root *root = arg;
1704 int again;
1705
1706 do {
1707 again = 0;
1708
1709
1710 if (btrfs_need_cleaner_sleep(root))
1711 goto sleep;
1712
1713 if (!mutex_trylock(&root->fs_info->cleaner_mutex))
1714 goto sleep;
1715
1716
1717
1718
1719
1720 if (btrfs_need_cleaner_sleep(root)) {
1721 mutex_unlock(&root->fs_info->cleaner_mutex);
1722 goto sleep;
1723 }
1724
1725 btrfs_run_delayed_iputs(root);
1726 again = btrfs_clean_one_deleted_snapshot(root);
1727 mutex_unlock(&root->fs_info->cleaner_mutex);
1728
1729
1730
1731
1732
1733 btrfs_run_defrag_inodes(root->fs_info);
1734sleep:
1735 if (!try_to_freeze() && !again) {
1736 set_current_state(TASK_INTERRUPTIBLE);
1737 if (!kthread_should_stop())
1738 schedule();
1739 __set_current_state(TASK_RUNNING);
1740 }
1741 } while (!kthread_should_stop());
1742 return 0;
1743}
1744
1745static int transaction_kthread(void *arg)
1746{
1747 struct btrfs_root *root = arg;
1748 struct btrfs_trans_handle *trans;
1749 struct btrfs_transaction *cur;
1750 u64 transid;
1751 unsigned long now;
1752 unsigned long delay;
1753 bool cannot_commit;
1754
1755 do {
1756 cannot_commit = false;
1757 delay = HZ * root->fs_info->commit_interval;
1758 mutex_lock(&root->fs_info->transaction_kthread_mutex);
1759
1760 spin_lock(&root->fs_info->trans_lock);
1761 cur = root->fs_info->running_transaction;
1762 if (!cur) {
1763 spin_unlock(&root->fs_info->trans_lock);
1764 goto sleep;
1765 }
1766
1767 now = get_seconds();
1768 if (cur->state < TRANS_STATE_BLOCKED &&
1769 (now < cur->start_time ||
1770 now - cur->start_time < root->fs_info->commit_interval)) {
1771 spin_unlock(&root->fs_info->trans_lock);
1772 delay = HZ * 5;
1773 goto sleep;
1774 }
1775 transid = cur->transid;
1776 spin_unlock(&root->fs_info->trans_lock);
1777
1778
1779 trans = btrfs_attach_transaction(root);
1780 if (IS_ERR(trans)) {
1781 if (PTR_ERR(trans) != -ENOENT)
1782 cannot_commit = true;
1783 goto sleep;
1784 }
1785 if (transid == trans->transid) {
1786 btrfs_commit_transaction(trans, root);
1787 } else {
1788 btrfs_end_transaction(trans, root);
1789 }
1790sleep:
1791 wake_up_process(root->fs_info->cleaner_kthread);
1792 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
1793
1794 if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
1795 &root->fs_info->fs_state)))
1796 btrfs_cleanup_transaction(root);
1797 if (!try_to_freeze()) {
1798 set_current_state(TASK_INTERRUPTIBLE);
1799 if (!kthread_should_stop() &&
1800 (!btrfs_transaction_blocked(root->fs_info) ||
1801 cannot_commit))
1802 schedule_timeout(delay);
1803 __set_current_state(TASK_RUNNING);
1804 }
1805 } while (!kthread_should_stop());
1806 return 0;
1807}
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen)
1819{
1820 u64 cur;
1821 int newest_index = -1;
1822 struct btrfs_root_backup *root_backup;
1823 int i;
1824
1825 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
1826 root_backup = info->super_copy->super_roots + i;
1827 cur = btrfs_backup_tree_root_gen(root_backup);
1828 if (cur == newest_gen)
1829 newest_index = i;
1830 }
1831
1832
1833 if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) {
1834 root_backup = info->super_copy->super_roots;
1835 cur = btrfs_backup_tree_root_gen(root_backup);
1836 if (cur == newest_gen)
1837 newest_index = 0;
1838 }
1839 return newest_index;
1840}
1841
1842
1843
1844
1845
1846
1847
1848static void find_oldest_super_backup(struct btrfs_fs_info *info,
1849 u64 newest_gen)
1850{
1851 int newest_index = -1;
1852
1853 newest_index = find_newest_super_backup(info, newest_gen);
1854
1855 if (newest_index == -1) {
1856 info->backup_root_index = 0;
1857 } else {
1858 info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS;
1859 }
1860}
1861
1862
1863
1864
1865
1866
1867static void backup_super_roots(struct btrfs_fs_info *info)
1868{
1869 int next_backup;
1870 struct btrfs_root_backup *root_backup;
1871 int last_backup;
1872
1873 next_backup = info->backup_root_index;
1874 last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) %
1875 BTRFS_NUM_BACKUP_ROOTS;
1876
1877
1878
1879
1880
1881 root_backup = info->super_for_commit->super_roots + last_backup;
1882 if (btrfs_backup_tree_root_gen(root_backup) ==
1883 btrfs_header_generation(info->tree_root->node))
1884 next_backup = last_backup;
1885
1886 root_backup = info->super_for_commit->super_roots + next_backup;
1887
1888
1889
1890
1891
1892 memset(root_backup, 0, sizeof(*root_backup));
1893
1894 info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
1895
1896 btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
1897 btrfs_set_backup_tree_root_gen(root_backup,
1898 btrfs_header_generation(info->tree_root->node));
1899
1900 btrfs_set_backup_tree_root_level(root_backup,
1901 btrfs_header_level(info->tree_root->node));
1902
1903 btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
1904 btrfs_set_backup_chunk_root_gen(root_backup,
1905 btrfs_header_generation(info->chunk_root->node));
1906 btrfs_set_backup_chunk_root_level(root_backup,
1907 btrfs_header_level(info->chunk_root->node));
1908
1909 btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
1910 btrfs_set_backup_extent_root_gen(root_backup,
1911 btrfs_header_generation(info->extent_root->node));
1912 btrfs_set_backup_extent_root_level(root_backup,
1913 btrfs_header_level(info->extent_root->node));
1914
1915
1916
1917
1918
1919 if (info->fs_root && info->fs_root->node) {
1920 btrfs_set_backup_fs_root(root_backup,
1921 info->fs_root->node->start);
1922 btrfs_set_backup_fs_root_gen(root_backup,
1923 btrfs_header_generation(info->fs_root->node));
1924 btrfs_set_backup_fs_root_level(root_backup,
1925 btrfs_header_level(info->fs_root->node));
1926 }
1927
1928 btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
1929 btrfs_set_backup_dev_root_gen(root_backup,
1930 btrfs_header_generation(info->dev_root->node));
1931 btrfs_set_backup_dev_root_level(root_backup,
1932 btrfs_header_level(info->dev_root->node));
1933
1934 btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start);
1935 btrfs_set_backup_csum_root_gen(root_backup,
1936 btrfs_header_generation(info->csum_root->node));
1937 btrfs_set_backup_csum_root_level(root_backup,
1938 btrfs_header_level(info->csum_root->node));
1939
1940 btrfs_set_backup_total_bytes(root_backup,
1941 btrfs_super_total_bytes(info->super_copy));
1942 btrfs_set_backup_bytes_used(root_backup,
1943 btrfs_super_bytes_used(info->super_copy));
1944 btrfs_set_backup_num_devices(root_backup,
1945 btrfs_super_num_devices(info->super_copy));
1946
1947
1948
1949
1950
1951 memcpy(&info->super_copy->super_roots,
1952 &info->super_for_commit->super_roots,
1953 sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
1954}
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964static noinline int next_root_backup(struct btrfs_fs_info *info,
1965 struct btrfs_super_block *super,
1966 int *num_backups_tried, int *backup_index)
1967{
1968 struct btrfs_root_backup *root_backup;
1969 int newest = *backup_index;
1970
1971 if (*num_backups_tried == 0) {
1972 u64 gen = btrfs_super_generation(super);
1973
1974 newest = find_newest_super_backup(info, gen);
1975 if (newest == -1)
1976 return -1;
1977
1978 *backup_index = newest;
1979 *num_backups_tried = 1;
1980 } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) {
1981
1982 return -1;
1983 } else {
1984
1985 newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) %
1986 BTRFS_NUM_BACKUP_ROOTS;
1987 *backup_index = newest;
1988 *num_backups_tried += 1;
1989 }
1990 root_backup = super->super_roots + newest;
1991
1992 btrfs_set_super_generation(super,
1993 btrfs_backup_tree_root_gen(root_backup));
1994 btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
1995 btrfs_set_super_root_level(super,
1996 btrfs_backup_tree_root_level(root_backup));
1997 btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
1998
1999
2000
2001
2002
2003 btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
2004 btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
2005 return 0;
2006}
2007
2008
2009static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
2010{
2011 btrfs_stop_workers(&fs_info->generic_worker);
2012 btrfs_stop_workers(&fs_info->fixup_workers);
2013 btrfs_stop_workers(&fs_info->delalloc_workers);
2014 btrfs_stop_workers(&fs_info->workers);
2015 btrfs_stop_workers(&fs_info->endio_workers);
2016 btrfs_stop_workers(&fs_info->endio_meta_workers);
2017 btrfs_stop_workers(&fs_info->endio_raid56_workers);
2018 btrfs_stop_workers(&fs_info->rmw_workers);
2019 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
2020 btrfs_stop_workers(&fs_info->endio_write_workers);
2021 btrfs_stop_workers(&fs_info->endio_freespace_worker);
2022 btrfs_stop_workers(&fs_info->submit_workers);
2023 btrfs_stop_workers(&fs_info->delayed_workers);
2024 btrfs_stop_workers(&fs_info->caching_workers);
2025 btrfs_stop_workers(&fs_info->readahead_workers);
2026 btrfs_stop_workers(&fs_info->flush_workers);
2027 btrfs_stop_workers(&fs_info->qgroup_rescan_workers);
2028}
2029
2030static void free_root_extent_buffers(struct btrfs_root *root)
2031{
2032 if (root) {
2033 free_extent_buffer(root->node);
2034 free_extent_buffer(root->commit_root);
2035 root->node = NULL;
2036 root->commit_root = NULL;
2037 }
2038}
2039
2040
2041static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
2042{
2043 free_root_extent_buffers(info->tree_root);
2044
2045 free_root_extent_buffers(info->dev_root);
2046 free_root_extent_buffers(info->extent_root);
2047 free_root_extent_buffers(info->csum_root);
2048 free_root_extent_buffers(info->quota_root);
2049 free_root_extent_buffers(info->uuid_root);
2050 if (chunk_root)
2051 free_root_extent_buffers(info->chunk_root);
2052}
2053
2054static void del_fs_roots(struct btrfs_fs_info *fs_info)
2055{
2056 int ret;
2057 struct btrfs_root *gang[8];
2058 int i;
2059
2060 while (!list_empty(&fs_info->dead_roots)) {
2061 gang[0] = list_entry(fs_info->dead_roots.next,
2062 struct btrfs_root, root_list);
2063 list_del(&gang[0]->root_list);
2064
2065 if (gang[0]->in_radix) {
2066 btrfs_drop_and_free_fs_root(fs_info, gang[0]);
2067 } else {
2068 free_extent_buffer(gang[0]->node);
2069 free_extent_buffer(gang[0]->commit_root);
2070 btrfs_put_fs_root(gang[0]);
2071 }
2072 }
2073
2074 while (1) {
2075 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2076 (void **)gang, 0,
2077 ARRAY_SIZE(gang));
2078 if (!ret)
2079 break;
2080 for (i = 0; i < ret; i++)
2081 btrfs_drop_and_free_fs_root(fs_info, gang[i]);
2082 }
2083}
2084
2085int open_ctree(struct super_block *sb,
2086 struct btrfs_fs_devices *fs_devices,
2087 char *options)
2088{
2089 u32 sectorsize;
2090 u32 nodesize;
2091 u32 leafsize;
2092 u32 blocksize;
2093 u32 stripesize;
2094 u64 generation;
2095 u64 features;
2096 struct btrfs_key location;
2097 struct buffer_head *bh;
2098 struct btrfs_super_block *disk_super;
2099 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2100 struct btrfs_root *tree_root;
2101 struct btrfs_root *extent_root;
2102 struct btrfs_root *csum_root;
2103 struct btrfs_root *chunk_root;
2104 struct btrfs_root *dev_root;
2105 struct btrfs_root *quota_root;
2106 struct btrfs_root *uuid_root;
2107 struct btrfs_root *log_tree_root;
2108 int ret;
2109 int err = -EINVAL;
2110 int num_backups_tried = 0;
2111 int backup_index = 0;
2112 bool create_uuid_tree;
2113 bool check_uuid_tree;
2114
2115 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info);
2116 chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info);
2117 if (!tree_root || !chunk_root) {
2118 err = -ENOMEM;
2119 goto fail;
2120 }
2121
2122 ret = init_srcu_struct(&fs_info->subvol_srcu);
2123 if (ret) {
2124 err = ret;
2125 goto fail;
2126 }
2127
2128 ret = setup_bdi(fs_info, &fs_info->bdi);
2129 if (ret) {
2130 err = ret;
2131 goto fail_srcu;
2132 }
2133
2134 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0);
2135 if (ret) {
2136 err = ret;
2137 goto fail_bdi;
2138 }
2139 fs_info->dirty_metadata_batch = PAGE_CACHE_SIZE *
2140 (1 + ilog2(nr_cpu_ids));
2141
2142 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0);
2143 if (ret) {
2144 err = ret;
2145 goto fail_dirty_metadata_bytes;
2146 }
2147
2148 fs_info->btree_inode = new_inode(sb);
2149 if (!fs_info->btree_inode) {
2150 err = -ENOMEM;
2151 goto fail_delalloc_bytes;
2152 }
2153
2154 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
2155
2156 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
2157 INIT_LIST_HEAD(&fs_info->trans_list);
2158 INIT_LIST_HEAD(&fs_info->dead_roots);
2159 INIT_LIST_HEAD(&fs_info->delayed_iputs);
2160 INIT_LIST_HEAD(&fs_info->delalloc_roots);
2161 INIT_LIST_HEAD(&fs_info->caching_block_groups);
2162 spin_lock_init(&fs_info->delalloc_root_lock);
2163 spin_lock_init(&fs_info->trans_lock);
2164 spin_lock_init(&fs_info->fs_roots_radix_lock);
2165 spin_lock_init(&fs_info->delayed_iput_lock);
2166 spin_lock_init(&fs_info->defrag_inodes_lock);
2167 spin_lock_init(&fs_info->free_chunk_lock);
2168 spin_lock_init(&fs_info->tree_mod_seq_lock);
2169 spin_lock_init(&fs_info->super_lock);
2170 rwlock_init(&fs_info->tree_mod_log_lock);
2171 mutex_init(&fs_info->reloc_mutex);
2172 seqlock_init(&fs_info->profiles_lock);
2173
2174 init_completion(&fs_info->kobj_unregister);
2175 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
2176 INIT_LIST_HEAD(&fs_info->space_info);
2177 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
2178 btrfs_mapping_init(&fs_info->mapping_tree);
2179 btrfs_init_block_rsv(&fs_info->global_block_rsv,
2180 BTRFS_BLOCK_RSV_GLOBAL);
2181 btrfs_init_block_rsv(&fs_info->delalloc_block_rsv,
2182 BTRFS_BLOCK_RSV_DELALLOC);
2183 btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
2184 btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
2185 btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
2186 btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
2187 BTRFS_BLOCK_RSV_DELOPS);
2188 atomic_set(&fs_info->nr_async_submits, 0);
2189 atomic_set(&fs_info->async_delalloc_pages, 0);
2190 atomic_set(&fs_info->async_submit_draining, 0);
2191 atomic_set(&fs_info->nr_async_bios, 0);
2192 atomic_set(&fs_info->defrag_running, 0);
2193 atomic64_set(&fs_info->tree_mod_seq, 0);
2194 fs_info->sb = sb;
2195 fs_info->max_inline = 8192 * 1024;
2196 fs_info->metadata_ratio = 0;
2197 fs_info->defrag_inodes = RB_ROOT;
2198 fs_info->free_chunk_space = 0;
2199 fs_info->tree_mod_log = RB_ROOT;
2200 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
2201
2202
2203 INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT);
2204 spin_lock_init(&fs_info->reada_lock);
2205
2206 fs_info->thread_pool_size = min_t(unsigned long,
2207 num_online_cpus() + 2, 8);
2208
2209 INIT_LIST_HEAD(&fs_info->ordered_roots);
2210 spin_lock_init(&fs_info->ordered_root_lock);
2211 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
2212 GFP_NOFS);
2213 if (!fs_info->delayed_root) {
2214 err = -ENOMEM;
2215 goto fail_iput;
2216 }
2217 btrfs_init_delayed_root(fs_info->delayed_root);
2218
2219 mutex_init(&fs_info->scrub_lock);
2220 atomic_set(&fs_info->scrubs_running, 0);
2221 atomic_set(&fs_info->scrub_pause_req, 0);
2222 atomic_set(&fs_info->scrubs_paused, 0);
2223 atomic_set(&fs_info->scrub_cancel_req, 0);
2224 init_waitqueue_head(&fs_info->scrub_pause_wait);
2225 fs_info->scrub_workers_refcnt = 0;
2226#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2227 fs_info->check_integrity_print_mask = 0;
2228#endif
2229
2230 spin_lock_init(&fs_info->balance_lock);
2231 mutex_init(&fs_info->balance_mutex);
2232 atomic_set(&fs_info->balance_running, 0);
2233 atomic_set(&fs_info->balance_pause_req, 0);
2234 atomic_set(&fs_info->balance_cancel_req, 0);
2235 fs_info->balance_ctl = NULL;
2236 init_waitqueue_head(&fs_info->balance_wait_q);
2237
2238 sb->s_blocksize = 4096;
2239 sb->s_blocksize_bits = blksize_bits(4096);
2240 sb->s_bdi = &fs_info->bdi;
2241
2242 fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
2243 set_nlink(fs_info->btree_inode, 1);
2244
2245
2246
2247
2248
2249 fs_info->btree_inode->i_size = OFFSET_MAX;
2250 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
2251 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
2252
2253 RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node);
2254 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
2255 fs_info->btree_inode->i_mapping);
2256 BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0;
2257 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree);
2258
2259 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
2260
2261 BTRFS_I(fs_info->btree_inode)->root = tree_root;
2262 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
2263 sizeof(struct btrfs_key));
2264 set_bit(BTRFS_INODE_DUMMY,
2265 &BTRFS_I(fs_info->btree_inode)->runtime_flags);
2266 btrfs_insert_inode_hash(fs_info->btree_inode);
2267
2268 spin_lock_init(&fs_info->block_group_cache_lock);
2269 fs_info->block_group_cache_tree = RB_ROOT;
2270 fs_info->first_logical_byte = (u64)-1;
2271
2272 extent_io_tree_init(&fs_info->freed_extents[0],
2273 fs_info->btree_inode->i_mapping);
2274 extent_io_tree_init(&fs_info->freed_extents[1],
2275 fs_info->btree_inode->i_mapping);
2276 fs_info->pinned_extents = &fs_info->freed_extents[0];
2277 fs_info->do_barriers = 1;
2278
2279
2280 mutex_init(&fs_info->ordered_operations_mutex);
2281 mutex_init(&fs_info->ordered_extent_flush_mutex);
2282 mutex_init(&fs_info->tree_log_mutex);
2283 mutex_init(&fs_info->chunk_mutex);
2284 mutex_init(&fs_info->transaction_kthread_mutex);
2285 mutex_init(&fs_info->cleaner_mutex);
2286 mutex_init(&fs_info->volume_mutex);
2287 init_rwsem(&fs_info->extent_commit_sem);
2288 init_rwsem(&fs_info->cleanup_work_sem);
2289 init_rwsem(&fs_info->subvol_sem);
2290 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
2291 fs_info->dev_replace.lock_owner = 0;
2292 atomic_set(&fs_info->dev_replace.nesting_level, 0);
2293 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2294 mutex_init(&fs_info->dev_replace.lock_management_lock);
2295 mutex_init(&fs_info->dev_replace.lock);
2296
2297 spin_lock_init(&fs_info->qgroup_lock);
2298 mutex_init(&fs_info->qgroup_ioctl_lock);
2299 fs_info->qgroup_tree = RB_ROOT;
2300 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2301 fs_info->qgroup_seq = 1;
2302 fs_info->quota_enabled = 0;
2303 fs_info->pending_quota_state = 0;
2304 fs_info->qgroup_ulist = NULL;
2305 mutex_init(&fs_info->qgroup_rescan_lock);
2306
2307 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
2308 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
2309
2310 init_waitqueue_head(&fs_info->transaction_throttle);
2311 init_waitqueue_head(&fs_info->transaction_wait);
2312 init_waitqueue_head(&fs_info->transaction_blocked_wait);
2313 init_waitqueue_head(&fs_info->async_submit_wait);
2314
2315 ret = btrfs_alloc_stripe_hash_table(fs_info);
2316 if (ret) {
2317 err = ret;
2318 goto fail_alloc;
2319 }
2320
2321 __setup_root(4096, 4096, 4096, 4096, tree_root,
2322 fs_info, BTRFS_ROOT_TREE_OBJECTID);
2323
2324 invalidate_bdev(fs_devices->latest_bdev);
2325
2326
2327
2328
2329 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
2330 if (!bh) {
2331 err = -EINVAL;
2332 goto fail_alloc;
2333 }
2334
2335
2336
2337
2338
2339 if (btrfs_check_super_csum(bh->b_data)) {
2340 printk(KERN_ERR "btrfs: superblock checksum mismatch\n");
2341 err = -EINVAL;
2342 goto fail_alloc;
2343 }
2344
2345
2346
2347
2348
2349
2350 memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy));
2351 memcpy(fs_info->super_for_commit, fs_info->super_copy,
2352 sizeof(*fs_info->super_for_commit));
2353 brelse(bh);
2354
2355 memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);
2356
2357 ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);
2358 if (ret) {
2359 printk(KERN_ERR "btrfs: superblock contains fatal errors\n");
2360 err = -EINVAL;
2361 goto fail_alloc;
2362 }
2363
2364 disk_super = fs_info->super_copy;
2365 if (!btrfs_super_root(disk_super))
2366 goto fail_alloc;
2367
2368
2369 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
2370 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
2371
2372
2373
2374
2375
2376 generation = btrfs_super_generation(disk_super);
2377 find_oldest_super_backup(fs_info, generation);
2378
2379
2380
2381
2382
2383 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
2384
2385 ret = btrfs_parse_options(tree_root, options);
2386 if (ret) {
2387 err = ret;
2388 goto fail_alloc;
2389 }
2390
2391 features = btrfs_super_incompat_flags(disk_super) &
2392 ~BTRFS_FEATURE_INCOMPAT_SUPP;
2393 if (features) {
2394 printk(KERN_ERR "BTRFS: couldn't mount because of "
2395 "unsupported optional features (%Lx).\n",
2396 features);
2397 err = -EINVAL;
2398 goto fail_alloc;
2399 }
2400
2401 if (btrfs_super_leafsize(disk_super) !=
2402 btrfs_super_nodesize(disk_super)) {
2403 printk(KERN_ERR "BTRFS: couldn't mount because metadata "
2404 "blocksizes don't match. node %d leaf %d\n",
2405 btrfs_super_nodesize(disk_super),
2406 btrfs_super_leafsize(disk_super));
2407 err = -EINVAL;
2408 goto fail_alloc;
2409 }
2410 if (btrfs_super_leafsize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) {
2411 printk(KERN_ERR "BTRFS: couldn't mount because metadata "
2412 "blocksize (%d) was too large\n",
2413 btrfs_super_leafsize(disk_super));
2414 err = -EINVAL;
2415 goto fail_alloc;
2416 }
2417
2418 features = btrfs_super_incompat_flags(disk_super);
2419 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
2420 if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
2421 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
2422
2423 if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
2424 printk(KERN_ERR "btrfs: has skinny extents\n");
2425
2426
2427
2428
2429
2430 if (btrfs_super_leafsize(disk_super) > PAGE_CACHE_SIZE) {
2431 if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
2432 printk(KERN_INFO "btrfs flagging fs with big metadata feature\n");
2433 features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
2434 }
2435
2436 nodesize = btrfs_super_nodesize(disk_super);
2437 leafsize = btrfs_super_leafsize(disk_super);
2438 sectorsize = btrfs_super_sectorsize(disk_super);
2439 stripesize = btrfs_super_stripesize(disk_super);
2440 fs_info->dirty_metadata_batch = leafsize * (1 + ilog2(nr_cpu_ids));
2441 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
2442
2443
2444
2445
2446
2447 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
2448 (sectorsize != leafsize)) {
2449 printk(KERN_WARNING "btrfs: unequal leaf/node/sector sizes "
2450 "are not allowed for mixed block groups on %s\n",
2451 sb->s_id);
2452 goto fail_alloc;
2453 }
2454
2455
2456
2457
2458
2459 btrfs_set_super_incompat_flags(disk_super, features);
2460
2461 features = btrfs_super_compat_ro_flags(disk_super) &
2462 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
2463 if (!(sb->s_flags & MS_RDONLY) && features) {
2464 printk(KERN_ERR "BTRFS: couldn't mount RDWR because of "
2465 "unsupported option features (%Lx).\n",
2466 features);
2467 err = -EINVAL;
2468 goto fail_alloc;
2469 }
2470
2471 btrfs_init_workers(&fs_info->generic_worker,
2472 "genwork", 1, NULL);
2473
2474 btrfs_init_workers(&fs_info->workers, "worker",
2475 fs_info->thread_pool_size,
2476 &fs_info->generic_worker);
2477
2478 btrfs_init_workers(&fs_info->delalloc_workers, "delalloc",
2479 fs_info->thread_pool_size, NULL);
2480
2481 btrfs_init_workers(&fs_info->flush_workers, "flush_delalloc",
2482 fs_info->thread_pool_size, NULL);
2483
2484 btrfs_init_workers(&fs_info->submit_workers, "submit",
2485 min_t(u64, fs_devices->num_devices,
2486 fs_info->thread_pool_size), NULL);
2487
2488 btrfs_init_workers(&fs_info->caching_workers, "cache",
2489 fs_info->thread_pool_size, NULL);
2490
2491
2492
2493
2494
2495 fs_info->submit_workers.idle_thresh = 64;
2496
2497 fs_info->workers.idle_thresh = 16;
2498 fs_info->workers.ordered = 1;
2499
2500 fs_info->delalloc_workers.idle_thresh = 2;
2501 fs_info->delalloc_workers.ordered = 1;
2502
2503 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1,
2504 &fs_info->generic_worker);
2505 btrfs_init_workers(&fs_info->endio_workers, "endio",
2506 fs_info->thread_pool_size,
2507 &fs_info->generic_worker);
2508 btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta",
2509 fs_info->thread_pool_size,
2510 &fs_info->generic_worker);
2511 btrfs_init_workers(&fs_info->endio_meta_write_workers,
2512 "endio-meta-write", fs_info->thread_pool_size,
2513 &fs_info->generic_worker);
2514 btrfs_init_workers(&fs_info->endio_raid56_workers,
2515 "endio-raid56", fs_info->thread_pool_size,
2516 &fs_info->generic_worker);
2517 btrfs_init_workers(&fs_info->rmw_workers,
2518 "rmw", fs_info->thread_pool_size,
2519 &fs_info->generic_worker);
2520 btrfs_init_workers(&fs_info->endio_write_workers, "endio-write",
2521 fs_info->thread_pool_size,
2522 &fs_info->generic_worker);
2523 btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write",
2524 1, &fs_info->generic_worker);
2525 btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta",
2526 fs_info->thread_pool_size,
2527 &fs_info->generic_worker);
2528 btrfs_init_workers(&fs_info->readahead_workers, "readahead",
2529 fs_info->thread_pool_size,
2530 &fs_info->generic_worker);
2531 btrfs_init_workers(&fs_info->qgroup_rescan_workers, "qgroup-rescan", 1,
2532 &fs_info->generic_worker);
2533
2534
2535
2536
2537
2538 fs_info->endio_workers.idle_thresh = 4;
2539 fs_info->endio_meta_workers.idle_thresh = 4;
2540 fs_info->endio_raid56_workers.idle_thresh = 4;
2541 fs_info->rmw_workers.idle_thresh = 2;
2542
2543 fs_info->endio_write_workers.idle_thresh = 2;
2544 fs_info->endio_meta_write_workers.idle_thresh = 2;
2545 fs_info->readahead_workers.idle_thresh = 2;
2546
2547
2548
2549
2550
2551 ret = btrfs_start_workers(&fs_info->workers);
2552 ret |= btrfs_start_workers(&fs_info->generic_worker);
2553 ret |= btrfs_start_workers(&fs_info->submit_workers);
2554 ret |= btrfs_start_workers(&fs_info->delalloc_workers);
2555 ret |= btrfs_start_workers(&fs_info->fixup_workers);
2556 ret |= btrfs_start_workers(&fs_info->endio_workers);
2557 ret |= btrfs_start_workers(&fs_info->endio_meta_workers);
2558 ret |= btrfs_start_workers(&fs_info->rmw_workers);
2559 ret |= btrfs_start_workers(&fs_info->endio_raid56_workers);
2560 ret |= btrfs_start_workers(&fs_info->endio_meta_write_workers);
2561 ret |= btrfs_start_workers(&fs_info->endio_write_workers);
2562 ret |= btrfs_start_workers(&fs_info->endio_freespace_worker);
2563 ret |= btrfs_start_workers(&fs_info->delayed_workers);
2564 ret |= btrfs_start_workers(&fs_info->caching_workers);
2565 ret |= btrfs_start_workers(&fs_info->readahead_workers);
2566 ret |= btrfs_start_workers(&fs_info->flush_workers);
2567 ret |= btrfs_start_workers(&fs_info->qgroup_rescan_workers);
2568 if (ret) {
2569 err = -ENOMEM;
2570 goto fail_sb_buffer;
2571 }
2572
2573 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
2574 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
2575 4 * 1024 * 1024 / PAGE_CACHE_SIZE);
2576
2577 tree_root->nodesize = nodesize;
2578 tree_root->leafsize = leafsize;
2579 tree_root->sectorsize = sectorsize;
2580 tree_root->stripesize = stripesize;
2581
2582 sb->s_blocksize = sectorsize;
2583 sb->s_blocksize_bits = blksize_bits(sectorsize);
2584
2585 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) {
2586 printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id);
2587 goto fail_sb_buffer;
2588 }
2589
2590 if (sectorsize != PAGE_SIZE) {
2591 printk(KERN_WARNING "btrfs: Incompatible sector size(%lu) "
2592 "found on %s\n", (unsigned long)sectorsize, sb->s_id);
2593 goto fail_sb_buffer;
2594 }
2595
2596 mutex_lock(&fs_info->chunk_mutex);
2597 ret = btrfs_read_sys_array(tree_root);
2598 mutex_unlock(&fs_info->chunk_mutex);
2599 if (ret) {
2600 printk(KERN_WARNING "btrfs: failed to read the system "
2601 "array on %s\n", sb->s_id);
2602 goto fail_sb_buffer;
2603 }
2604
2605 blocksize = btrfs_level_size(tree_root,
2606 btrfs_super_chunk_root_level(disk_super));
2607 generation = btrfs_super_chunk_root_generation(disk_super);
2608
2609 __setup_root(nodesize, leafsize, sectorsize, stripesize,
2610 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
2611
2612 chunk_root->node = read_tree_block(chunk_root,
2613 btrfs_super_chunk_root(disk_super),
2614 blocksize, generation);
2615 if (!chunk_root->node ||
2616 !test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
2617 printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n",
2618 sb->s_id);
2619 goto fail_tree_roots;
2620 }
2621 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
2622 chunk_root->commit_root = btrfs_root_node(chunk_root);
2623
2624 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
2625 btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE);
2626
2627 ret = btrfs_read_chunk_tree(chunk_root);
2628 if (ret) {
2629 printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n",
2630 sb->s_id);
2631 goto fail_tree_roots;
2632 }
2633
2634
2635
2636
2637
2638 btrfs_close_extra_devices(fs_info, fs_devices, 0);
2639
2640 if (!fs_devices->latest_bdev) {
2641 printk(KERN_CRIT "btrfs: failed to read devices on %s\n",
2642 sb->s_id);
2643 goto fail_tree_roots;
2644 }
2645
2646retry_root_backup:
2647 blocksize = btrfs_level_size(tree_root,
2648 btrfs_super_root_level(disk_super));
2649 generation = btrfs_super_generation(disk_super);
2650
2651 tree_root->node = read_tree_block(tree_root,
2652 btrfs_super_root(disk_super),
2653 blocksize, generation);
2654 if (!tree_root->node ||
2655 !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) {
2656 printk(KERN_WARNING "btrfs: failed to read tree root on %s\n",
2657 sb->s_id);
2658
2659 goto recovery_tree_root;
2660 }
2661
2662 btrfs_set_root_node(&tree_root->root_item, tree_root->node);
2663 tree_root->commit_root = btrfs_root_node(tree_root);
2664 btrfs_set_root_refs(&tree_root->root_item, 1);
2665
2666 location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
2667 location.type = BTRFS_ROOT_ITEM_KEY;
2668 location.offset = 0;
2669
2670 extent_root = btrfs_read_tree_root(tree_root, &location);
2671 if (IS_ERR(extent_root)) {
2672 ret = PTR_ERR(extent_root);
2673 goto recovery_tree_root;
2674 }
2675 extent_root->track_dirty = 1;
2676 fs_info->extent_root = extent_root;
2677
2678 location.objectid = BTRFS_DEV_TREE_OBJECTID;
2679 dev_root = btrfs_read_tree_root(tree_root, &location);
2680 if (IS_ERR(dev_root)) {
2681 ret = PTR_ERR(dev_root);
2682 goto recovery_tree_root;
2683 }
2684 dev_root->track_dirty = 1;
2685 fs_info->dev_root = dev_root;
2686 btrfs_init_devices_late(fs_info);
2687
2688 location.objectid = BTRFS_CSUM_TREE_OBJECTID;
2689 csum_root = btrfs_read_tree_root(tree_root, &location);
2690 if (IS_ERR(csum_root)) {
2691 ret = PTR_ERR(csum_root);
2692 goto recovery_tree_root;
2693 }
2694 csum_root->track_dirty = 1;
2695 fs_info->csum_root = csum_root;
2696
2697 location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2698 quota_root = btrfs_read_tree_root(tree_root, &location);
2699 if (!IS_ERR(quota_root)) {
2700 quota_root->track_dirty = 1;
2701 fs_info->quota_enabled = 1;
2702 fs_info->pending_quota_state = 1;
2703 fs_info->quota_root = quota_root;
2704 }
2705
2706 location.objectid = BTRFS_UUID_TREE_OBJECTID;
2707 uuid_root = btrfs_read_tree_root(tree_root, &location);
2708 if (IS_ERR(uuid_root)) {
2709 ret = PTR_ERR(uuid_root);
2710 if (ret != -ENOENT)
2711 goto recovery_tree_root;
2712 create_uuid_tree = true;
2713 check_uuid_tree = false;
2714 } else {
2715 uuid_root->track_dirty = 1;
2716 fs_info->uuid_root = uuid_root;
2717 create_uuid_tree = false;
2718 check_uuid_tree =
2719 generation != btrfs_super_uuid_tree_generation(disk_super);
2720 }
2721
2722 fs_info->generation = generation;
2723 fs_info->last_trans_committed = generation;
2724
2725 ret = btrfs_recover_balance(fs_info);
2726 if (ret) {
2727 printk(KERN_WARNING "btrfs: failed to recover balance\n");
2728 goto fail_block_groups;
2729 }
2730
2731 ret = btrfs_init_dev_stats(fs_info);
2732 if (ret) {
2733 printk(KERN_ERR "btrfs: failed to init dev_stats: %d\n",
2734 ret);
2735 goto fail_block_groups;
2736 }
2737
2738 ret = btrfs_init_dev_replace(fs_info);
2739 if (ret) {
2740 pr_err("btrfs: failed to init dev_replace: %d\n", ret);
2741 goto fail_block_groups;
2742 }
2743
2744 btrfs_close_extra_devices(fs_info, fs_devices, 1);
2745
2746 ret = btrfs_init_space_info(fs_info);
2747 if (ret) {
2748 printk(KERN_ERR "Failed to initial space info: %d\n", ret);
2749 goto fail_block_groups;
2750 }
2751
2752 ret = btrfs_read_block_groups(extent_root);
2753 if (ret) {
2754 printk(KERN_ERR "Failed to read block groups: %d\n", ret);
2755 goto fail_block_groups;
2756 }
2757 fs_info->num_tolerated_disk_barrier_failures =
2758 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
2759 if (fs_info->fs_devices->missing_devices >
2760 fs_info->num_tolerated_disk_barrier_failures &&
2761 !(sb->s_flags & MS_RDONLY)) {
2762 printk(KERN_WARNING
2763 "Btrfs: too many missing devices, writeable mount is not allowed\n");
2764 goto fail_block_groups;
2765 }
2766
2767 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
2768 "btrfs-cleaner");
2769 if (IS_ERR(fs_info->cleaner_kthread))
2770 goto fail_block_groups;
2771
2772 fs_info->transaction_kthread = kthread_run(transaction_kthread,
2773 tree_root,
2774 "btrfs-transaction");
2775 if (IS_ERR(fs_info->transaction_kthread))
2776 goto fail_cleaner;
2777
2778 if (!btrfs_test_opt(tree_root, SSD) &&
2779 !btrfs_test_opt(tree_root, NOSSD) &&
2780 !fs_info->fs_devices->rotating) {
2781 printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD "
2782 "mode\n");
2783 btrfs_set_opt(fs_info->mount_opt, SSD);
2784 }
2785
2786#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2787 if (btrfs_test_opt(tree_root, CHECK_INTEGRITY)) {
2788 ret = btrfsic_mount(tree_root, fs_devices,
2789 btrfs_test_opt(tree_root,
2790 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ?
2791 1 : 0,
2792 fs_info->check_integrity_print_mask);
2793 if (ret)
2794 printk(KERN_WARNING "btrfs: failed to initialize"
2795 " integrity check module %s\n", sb->s_id);
2796 }
2797#endif
2798 ret = btrfs_read_qgroup_config(fs_info);
2799 if (ret)
2800 goto fail_trans_kthread;
2801
2802
2803 if (btrfs_super_log_root(disk_super) != 0) {
2804 u64 bytenr = btrfs_super_log_root(disk_super);
2805
2806 if (fs_devices->rw_devices == 0) {
2807 printk(KERN_WARNING "Btrfs log replay required "
2808 "on RO media\n");
2809 err = -EIO;
2810 goto fail_qgroup;
2811 }
2812 blocksize =
2813 btrfs_level_size(tree_root,
2814 btrfs_super_log_root_level(disk_super));
2815
2816 log_tree_root = btrfs_alloc_root(fs_info);
2817 if (!log_tree_root) {
2818 err = -ENOMEM;
2819 goto fail_qgroup;
2820 }
2821
2822 __setup_root(nodesize, leafsize, sectorsize, stripesize,
2823 log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
2824
2825 log_tree_root->node = read_tree_block(tree_root, bytenr,
2826 blocksize,
2827 generation + 1);
2828 if (!log_tree_root->node ||
2829 !extent_buffer_uptodate(log_tree_root->node)) {
2830 printk(KERN_ERR "btrfs: failed to read log tree\n");
2831 free_extent_buffer(log_tree_root->node);
2832 kfree(log_tree_root);
2833 goto fail_trans_kthread;
2834 }
2835
2836 ret = btrfs_recover_log_trees(log_tree_root);
2837 if (ret) {
2838 btrfs_error(tree_root->fs_info, ret,
2839 "Failed to recover log tree");
2840 free_extent_buffer(log_tree_root->node);
2841 kfree(log_tree_root);
2842 goto fail_trans_kthread;
2843 }
2844
2845 if (sb->s_flags & MS_RDONLY) {
2846 ret = btrfs_commit_super(tree_root);
2847 if (ret)
2848 goto fail_trans_kthread;
2849 }
2850 }
2851
2852 ret = btrfs_find_orphan_roots(tree_root);
2853 if (ret)
2854 goto fail_trans_kthread;
2855
2856 if (!(sb->s_flags & MS_RDONLY)) {
2857 ret = btrfs_cleanup_fs_roots(fs_info);
2858 if (ret)
2859 goto fail_trans_kthread;
2860
2861 ret = btrfs_recover_relocation(tree_root);
2862 if (ret < 0) {
2863 printk(KERN_WARNING
2864 "btrfs: failed to recover relocation\n");
2865 err = -EINVAL;
2866 goto fail_qgroup;
2867 }
2868 }
2869
2870 location.objectid = BTRFS_FS_TREE_OBJECTID;
2871 location.type = BTRFS_ROOT_ITEM_KEY;
2872 location.offset = 0;
2873
2874 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
2875 if (IS_ERR(fs_info->fs_root)) {
2876 err = PTR_ERR(fs_info->fs_root);
2877 goto fail_qgroup;
2878 }
2879
2880 if (sb->s_flags & MS_RDONLY)
2881 return 0;
2882
2883 down_read(&fs_info->cleanup_work_sem);
2884 if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
2885 (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
2886 up_read(&fs_info->cleanup_work_sem);
2887 close_ctree(tree_root);
2888 return ret;
2889 }
2890 up_read(&fs_info->cleanup_work_sem);
2891
2892 ret = btrfs_resume_balance_async(fs_info);
2893 if (ret) {
2894 printk(KERN_WARNING "btrfs: failed to resume balance\n");
2895 close_ctree(tree_root);
2896 return ret;
2897 }
2898
2899 ret = btrfs_resume_dev_replace_async(fs_info);
2900 if (ret) {
2901 pr_warn("btrfs: failed to resume dev_replace\n");
2902 close_ctree(tree_root);
2903 return ret;
2904 }
2905
2906 btrfs_qgroup_rescan_resume(fs_info);
2907
2908 if (create_uuid_tree) {
2909 pr_info("btrfs: creating UUID tree\n");
2910 ret = btrfs_create_uuid_tree(fs_info);
2911 if (ret) {
2912 pr_warn("btrfs: failed to create the UUID tree %d\n",
2913 ret);
2914 close_ctree(tree_root);
2915 return ret;
2916 }
2917 } else if (check_uuid_tree ||
2918 btrfs_test_opt(tree_root, RESCAN_UUID_TREE)) {
2919 pr_info("btrfs: checking UUID tree\n");
2920 ret = btrfs_check_uuid_tree(fs_info);
2921 if (ret) {
2922 pr_warn("btrfs: failed to check the UUID tree %d\n",
2923 ret);
2924 close_ctree(tree_root);
2925 return ret;
2926 }
2927 } else {
2928 fs_info->update_uuid_tree_gen = 1;
2929 }
2930
2931 return 0;
2932
2933fail_qgroup:
2934 btrfs_free_qgroup_config(fs_info);
2935fail_trans_kthread:
2936 kthread_stop(fs_info->transaction_kthread);
2937 btrfs_cleanup_transaction(fs_info->tree_root);
2938 del_fs_roots(fs_info);
2939fail_cleaner:
2940 kthread_stop(fs_info->cleaner_kthread);
2941
2942
2943
2944
2945
2946 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
2947
2948fail_block_groups:
2949 btrfs_put_block_group_cache(fs_info);
2950 btrfs_free_block_groups(fs_info);
2951
2952fail_tree_roots:
2953 free_root_pointers(fs_info, 1);
2954 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
2955
2956fail_sb_buffer:
2957 btrfs_stop_all_workers(fs_info);
2958fail_alloc:
2959fail_iput:
2960 btrfs_mapping_tree_free(&fs_info->mapping_tree);
2961
2962 iput(fs_info->btree_inode);
2963fail_delalloc_bytes:
2964 percpu_counter_destroy(&fs_info->delalloc_bytes);
2965fail_dirty_metadata_bytes:
2966 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
2967fail_bdi:
2968 bdi_destroy(&fs_info->bdi);
2969fail_srcu:
2970 cleanup_srcu_struct(&fs_info->subvol_srcu);
2971fail:
2972 btrfs_free_stripe_hash_table(fs_info);
2973 btrfs_close_devices(fs_info->fs_devices);
2974 return err;
2975
2976recovery_tree_root:
2977 if (!btrfs_test_opt(tree_root, RECOVERY))
2978 goto fail_tree_roots;
2979
2980 free_root_pointers(fs_info, 0);
2981
2982
2983 btrfs_set_super_log_root(disk_super, 0);
2984
2985
2986 btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
2987
2988 ret = next_root_backup(fs_info, fs_info->super_copy,
2989 &num_backups_tried, &backup_index);
2990 if (ret == -1)
2991 goto fail_block_groups;
2992 goto retry_root_backup;
2993}
2994
2995static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
2996{
2997 if (uptodate) {
2998 set_buffer_uptodate(bh);
2999 } else {
3000 struct btrfs_device *device = (struct btrfs_device *)
3001 bh->b_private;
3002
3003 printk_ratelimited_in_rcu(KERN_WARNING "lost page write due to "
3004 "I/O error on %s\n",
3005 rcu_str_deref(device->name));
3006
3007
3008
3009 clear_buffer_uptodate(bh);
3010 btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS);
3011 }
3012 unlock_buffer(bh);
3013 put_bh(bh);
3014}
3015
3016struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
3017{
3018 struct buffer_head *bh;
3019 struct buffer_head *latest = NULL;
3020 struct btrfs_super_block *super;
3021 int i;
3022 u64 transid = 0;
3023 u64 bytenr;
3024
3025
3026
3027
3028
3029
3030 for (i = 0; i < 1; i++) {
3031 bytenr = btrfs_sb_offset(i);
3032 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3033 i_size_read(bdev->bd_inode))
3034 break;
3035 bh = __bread(bdev, bytenr / 4096,
3036 BTRFS_SUPER_INFO_SIZE);
3037 if (!bh)
3038 continue;
3039
3040 super = (struct btrfs_super_block *)bh->b_data;
3041 if (btrfs_super_bytenr(super) != bytenr ||
3042 btrfs_super_magic(super) != BTRFS_MAGIC) {
3043 brelse(bh);
3044 continue;
3045 }
3046
3047 if (!latest || btrfs_super_generation(super) > transid) {
3048 brelse(latest);
3049 latest = bh;
3050 transid = btrfs_super_generation(super);
3051 } else {
3052 brelse(bh);
3053 }
3054 }
3055 return latest;
3056}
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069static int write_dev_supers(struct btrfs_device *device,
3070 struct btrfs_super_block *sb,
3071 int do_barriers, int wait, int max_mirrors)
3072{
3073 struct buffer_head *bh;
3074 int i;
3075 int ret;
3076 int errors = 0;
3077 u32 crc;
3078 u64 bytenr;
3079
3080 if (max_mirrors == 0)
3081 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
3082
3083 for (i = 0; i < max_mirrors; i++) {
3084 bytenr = btrfs_sb_offset(i);
3085 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
3086 break;
3087
3088 if (wait) {
3089 bh = __find_get_block(device->bdev, bytenr / 4096,
3090 BTRFS_SUPER_INFO_SIZE);
3091 if (!bh) {
3092 errors++;
3093 continue;
3094 }
3095 wait_on_buffer(bh);
3096 if (!buffer_uptodate(bh))
3097 errors++;
3098
3099
3100 brelse(bh);
3101
3102
3103 brelse(bh);
3104 continue;
3105 } else {
3106 btrfs_set_super_bytenr(sb, bytenr);
3107
3108 crc = ~(u32)0;
3109 crc = btrfs_csum_data((char *)sb +
3110 BTRFS_CSUM_SIZE, crc,
3111 BTRFS_SUPER_INFO_SIZE -
3112 BTRFS_CSUM_SIZE);
3113 btrfs_csum_final(crc, sb->csum);
3114
3115
3116
3117
3118
3119 bh = __getblk(device->bdev, bytenr / 4096,
3120 BTRFS_SUPER_INFO_SIZE);
3121 if (!bh) {
3122 printk(KERN_ERR "btrfs: couldn't get super "
3123 "buffer head for bytenr %Lu\n", bytenr);
3124 errors++;
3125 continue;
3126 }
3127
3128 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
3129
3130
3131 get_bh(bh);
3132
3133 set_buffer_uptodate(bh);
3134 lock_buffer(bh);
3135 bh->b_end_io = btrfs_end_buffer_write_sync;
3136 bh->b_private = device;
3137 }
3138
3139
3140
3141
3142
3143 ret = btrfsic_submit_bh(WRITE_FUA, bh);
3144 if (ret)
3145 errors++;
3146 }
3147 return errors < i ? 0 : -1;
3148}
3149
3150
3151
3152
3153
3154static void btrfs_end_empty_barrier(struct bio *bio, int err)
3155{
3156 if (err) {
3157 if (err == -EOPNOTSUPP)
3158 set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
3159 clear_bit(BIO_UPTODATE, &bio->bi_flags);
3160 }
3161 if (bio->bi_private)
3162 complete(bio->bi_private);
3163 bio_put(bio);
3164}
3165
3166
3167
3168
3169
3170
3171
3172
3173static int write_dev_flush(struct btrfs_device *device, int wait)
3174{
3175 struct bio *bio;
3176 int ret = 0;
3177
3178 if (device->nobarriers)
3179 return 0;
3180
3181 if (wait) {
3182 bio = device->flush_bio;
3183 if (!bio)
3184 return 0;
3185
3186 wait_for_completion(&device->flush_wait);
3187
3188 if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
3189 printk_in_rcu("btrfs: disabling barriers on dev %s\n",
3190 rcu_str_deref(device->name));
3191 device->nobarriers = 1;
3192 } else if (!bio_flagged(bio, BIO_UPTODATE)) {
3193 ret = -EIO;
3194 btrfs_dev_stat_inc_and_print(device,
3195 BTRFS_DEV_STAT_FLUSH_ERRS);
3196 }
3197
3198
3199 bio_put(bio);
3200 device->flush_bio = NULL;
3201
3202 return ret;
3203 }
3204
3205
3206
3207
3208
3209 device->flush_bio = NULL;
3210 bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
3211 if (!bio)
3212 return -ENOMEM;
3213
3214 bio->bi_end_io = btrfs_end_empty_barrier;
3215 bio->bi_bdev = device->bdev;
3216 init_completion(&device->flush_wait);
3217 bio->bi_private = &device->flush_wait;
3218 device->flush_bio = bio;
3219
3220 bio_get(bio);
3221 btrfsic_submit_bio(WRITE_FLUSH, bio);
3222
3223 return 0;
3224}
3225
3226
3227
3228
3229
3230static int barrier_all_devices(struct btrfs_fs_info *info)
3231{
3232 struct list_head *head;
3233 struct btrfs_device *dev;
3234 int errors_send = 0;
3235 int errors_wait = 0;
3236 int ret;
3237
3238
3239 head = &info->fs_devices->devices;
3240 list_for_each_entry_rcu(dev, head, dev_list) {
3241 if (!dev->bdev) {
3242 errors_send++;
3243 continue;
3244 }
3245 if (!dev->in_fs_metadata || !dev->writeable)
3246 continue;
3247
3248 ret = write_dev_flush(dev, 0);
3249 if (ret)
3250 errors_send++;
3251 }
3252
3253
3254 list_for_each_entry_rcu(dev, head, dev_list) {
3255 if (!dev->bdev) {
3256 errors_wait++;
3257 continue;
3258 }
3259 if (!dev->in_fs_metadata || !dev->writeable)
3260 continue;
3261
3262 ret = write_dev_flush(dev, 1);
3263 if (ret)
3264 errors_wait++;
3265 }
3266 if (errors_send > info->num_tolerated_disk_barrier_failures ||
3267 errors_wait > info->num_tolerated_disk_barrier_failures)
3268 return -EIO;
3269 return 0;
3270}
3271
3272int btrfs_calc_num_tolerated_disk_barrier_failures(
3273 struct btrfs_fs_info *fs_info)
3274{
3275 struct btrfs_ioctl_space_info space;
3276 struct btrfs_space_info *sinfo;
3277 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3278 BTRFS_BLOCK_GROUP_SYSTEM,
3279 BTRFS_BLOCK_GROUP_METADATA,
3280 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3281 int num_types = 4;
3282 int i;
3283 int c;
3284 int num_tolerated_disk_barrier_failures =
3285 (int)fs_info->fs_devices->num_devices;
3286
3287 for (i = 0; i < num_types; i++) {
3288 struct btrfs_space_info *tmp;
3289
3290 sinfo = NULL;
3291 rcu_read_lock();
3292 list_for_each_entry_rcu(tmp, &fs_info->space_info, list) {
3293 if (tmp->flags == types[i]) {
3294 sinfo = tmp;
3295 break;
3296 }
3297 }
3298 rcu_read_unlock();
3299
3300 if (!sinfo)
3301 continue;
3302
3303 down_read(&sinfo->groups_sem);
3304 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3305 if (!list_empty(&sinfo->block_groups[c])) {
3306 u64 flags;
3307
3308 btrfs_get_block_group_info(
3309 &sinfo->block_groups[c], &space);
3310 if (space.total_bytes == 0 ||
3311 space.used_bytes == 0)
3312 continue;
3313 flags = space.flags;
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326 if (num_tolerated_disk_barrier_failures > 0 &&
3327 ((flags & (BTRFS_BLOCK_GROUP_DUP |
3328 BTRFS_BLOCK_GROUP_RAID0)) ||
3329 ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK)
3330 == 0)))
3331 num_tolerated_disk_barrier_failures = 0;
3332 else if (num_tolerated_disk_barrier_failures > 1) {
3333 if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
3334 BTRFS_BLOCK_GROUP_RAID5 |
3335 BTRFS_BLOCK_GROUP_RAID10)) {
3336 num_tolerated_disk_barrier_failures = 1;
3337 } else if (flags &
3338 BTRFS_BLOCK_GROUP_RAID6) {
3339 num_tolerated_disk_barrier_failures = 2;
3340 }
3341 }
3342 }
3343 }
3344 up_read(&sinfo->groups_sem);
3345 }
3346
3347 return num_tolerated_disk_barrier_failures;
3348}
3349
3350static int write_all_supers(struct btrfs_root *root, int max_mirrors)
3351{
3352 struct list_head *head;
3353 struct btrfs_device *dev;
3354 struct btrfs_super_block *sb;
3355 struct btrfs_dev_item *dev_item;
3356 int ret;
3357 int do_barriers;
3358 int max_errors;
3359 int total_errors = 0;
3360 u64 flags;
3361
3362 do_barriers = !btrfs_test_opt(root, NOBARRIER);
3363 backup_super_roots(root->fs_info);
3364
3365 sb = root->fs_info->super_for_commit;
3366 dev_item = &sb->dev_item;
3367
3368 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
3369 head = &root->fs_info->fs_devices->devices;
3370 max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1;
3371
3372 if (do_barriers) {
3373 ret = barrier_all_devices(root->fs_info);
3374 if (ret) {
3375 mutex_unlock(
3376 &root->fs_info->fs_devices->device_list_mutex);
3377 btrfs_error(root->fs_info, ret,
3378 "errors while submitting device barriers.");
3379 return ret;
3380 }
3381 }
3382
3383 list_for_each_entry_rcu(dev, head, dev_list) {
3384 if (!dev->bdev) {
3385 total_errors++;
3386 continue;
3387 }
3388 if (!dev->in_fs_metadata || !dev->writeable)
3389 continue;
3390
3391 btrfs_set_stack_device_generation(dev_item, 0);
3392 btrfs_set_stack_device_type(dev_item, dev->type);
3393 btrfs_set_stack_device_id(dev_item, dev->devid);
3394 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
3395 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
3396 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
3397 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
3398 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
3399 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
3400 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
3401
3402 flags = btrfs_super_flags(sb);
3403 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
3404
3405 ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
3406 if (ret)
3407 total_errors++;
3408 }
3409 if (total_errors > max_errors) {
3410 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
3411 total_errors);
3412 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3413
3414
3415 btrfs_error(root->fs_info, -EIO,
3416 "%d errors while writing supers", total_errors);
3417 return -EIO;
3418 }
3419
3420 total_errors = 0;
3421 list_for_each_entry_rcu(dev, head, dev_list) {
3422 if (!dev->bdev)
3423 continue;
3424 if (!dev->in_fs_metadata || !dev->writeable)
3425 continue;
3426
3427 ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
3428 if (ret)
3429 total_errors++;
3430 }
3431 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3432 if (total_errors > max_errors) {
3433 btrfs_error(root->fs_info, -EIO,
3434 "%d errors while writing supers", total_errors);
3435 return -EIO;
3436 }
3437 return 0;
3438}
3439
3440int write_ctree_super(struct btrfs_trans_handle *trans,
3441 struct btrfs_root *root, int max_mirrors)
3442{
3443 return write_all_supers(root, max_mirrors);
3444}
3445
3446
3447void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
3448 struct btrfs_root *root)
3449{
3450 spin_lock(&fs_info->fs_roots_radix_lock);
3451 radix_tree_delete(&fs_info->fs_roots_radix,
3452 (unsigned long)root->root_key.objectid);
3453 spin_unlock(&fs_info->fs_roots_radix_lock);
3454
3455 if (btrfs_root_refs(&root->root_item) == 0)
3456 synchronize_srcu(&fs_info->subvol_srcu);
3457
3458 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
3459 btrfs_free_log(NULL, root);
3460 btrfs_free_log_root_tree(NULL, fs_info);
3461 }
3462
3463 __btrfs_remove_free_space_cache(root->free_ino_pinned);
3464 __btrfs_remove_free_space_cache(root->free_ino_ctl);
3465 free_fs_root(root);
3466}
3467
3468static void free_fs_root(struct btrfs_root *root)
3469{
3470 iput(root->cache_inode);
3471 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
3472 btrfs_free_block_rsv(root, root->orphan_block_rsv);
3473 root->orphan_block_rsv = NULL;
3474 if (root->anon_dev)
3475 free_anon_bdev(root->anon_dev);
3476 free_extent_buffer(root->node);
3477 free_extent_buffer(root->commit_root);
3478 kfree(root->free_ino_ctl);
3479 kfree(root->free_ino_pinned);
3480 kfree(root->name);
3481 btrfs_put_fs_root(root);
3482}
3483
3484void btrfs_free_fs_root(struct btrfs_root *root)
3485{
3486 free_fs_root(root);
3487}
3488
3489int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
3490{
3491 u64 root_objectid = 0;
3492 struct btrfs_root *gang[8];
3493 int i;
3494 int ret;
3495
3496 while (1) {
3497 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
3498 (void **)gang, root_objectid,
3499 ARRAY_SIZE(gang));
3500 if (!ret)
3501 break;
3502
3503 root_objectid = gang[ret - 1]->root_key.objectid + 1;
3504 for (i = 0; i < ret; i++) {
3505 int err;
3506
3507 root_objectid = gang[i]->root_key.objectid;
3508 err = btrfs_orphan_cleanup(gang[i]);
3509 if (err)
3510 return err;
3511 }
3512 root_objectid++;
3513 }
3514 return 0;
3515}
3516
3517int btrfs_commit_super(struct btrfs_root *root)
3518{
3519 struct btrfs_trans_handle *trans;
3520
3521 mutex_lock(&root->fs_info->cleaner_mutex);
3522 btrfs_run_delayed_iputs(root);
3523 mutex_unlock(&root->fs_info->cleaner_mutex);
3524 wake_up_process(root->fs_info->cleaner_kthread);
3525
3526
3527 down_write(&root->fs_info->cleanup_work_sem);
3528 up_write(&root->fs_info->cleanup_work_sem);
3529
3530 trans = btrfs_join_transaction(root);
3531 if (IS_ERR(trans))
3532 return PTR_ERR(trans);
3533 return btrfs_commit_transaction(trans, root);
3534}
3535
3536int close_ctree(struct btrfs_root *root)
3537{
3538 struct btrfs_fs_info *fs_info = root->fs_info;
3539 int ret;
3540
3541 fs_info->closing = 1;
3542 smp_mb();
3543
3544
3545 down(&fs_info->uuid_tree_rescan_sem);
3546
3547 up(&fs_info->uuid_tree_rescan_sem);
3548
3549
3550 btrfs_pause_balance(fs_info);
3551
3552 btrfs_dev_replace_suspend_for_unmount(fs_info);
3553
3554 btrfs_scrub_cancel(fs_info);
3555
3556
3557 wait_event(fs_info->transaction_wait,
3558 (atomic_read(&fs_info->defrag_running) == 0));
3559
3560
3561 btrfs_cleanup_defrag_inodes(fs_info);
3562
3563 if (!(fs_info->sb->s_flags & MS_RDONLY)) {
3564 ret = btrfs_commit_super(root);
3565 if (ret)
3566 printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
3567 }
3568
3569 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
3570 btrfs_error_commit_super(root);
3571
3572 btrfs_put_block_group_cache(fs_info);
3573
3574 kthread_stop(fs_info->transaction_kthread);
3575 kthread_stop(fs_info->cleaner_kthread);
3576
3577 fs_info->closing = 2;
3578 smp_mb();
3579
3580 btrfs_free_qgroup_config(root->fs_info);
3581
3582 if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
3583 printk(KERN_INFO "btrfs: at unmount delalloc count %lld\n",
3584 percpu_counter_sum(&fs_info->delalloc_bytes));
3585 }
3586
3587 del_fs_roots(fs_info);
3588
3589 btrfs_free_block_groups(fs_info);
3590
3591 btrfs_stop_all_workers(fs_info);
3592
3593 free_root_pointers(fs_info, 1);
3594
3595 iput(fs_info->btree_inode);
3596
3597#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3598 if (btrfs_test_opt(root, CHECK_INTEGRITY))
3599 btrfsic_unmount(root, fs_info->fs_devices);
3600#endif
3601
3602 btrfs_close_devices(fs_info->fs_devices);
3603 btrfs_mapping_tree_free(&fs_info->mapping_tree);
3604
3605 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
3606 percpu_counter_destroy(&fs_info->delalloc_bytes);
3607 bdi_destroy(&fs_info->bdi);
3608 cleanup_srcu_struct(&fs_info->subvol_srcu);
3609
3610 btrfs_free_stripe_hash_table(fs_info);
3611
3612 btrfs_free_block_rsv(root, root->orphan_block_rsv);
3613 root->orphan_block_rsv = NULL;
3614
3615 return 0;
3616}
3617
3618int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
3619 int atomic)
3620{
3621 int ret;
3622 struct inode *btree_inode = buf->pages[0]->mapping->host;
3623
3624 ret = extent_buffer_uptodate(buf);
3625 if (!ret)
3626 return ret;
3627
3628 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
3629 parent_transid, atomic);
3630 if (ret == -EAGAIN)
3631 return ret;
3632 return !ret;
3633}
3634
3635int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
3636{
3637 return set_extent_buffer_uptodate(buf);
3638}
3639
3640void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
3641{
3642 struct btrfs_root *root;
3643 u64 transid = btrfs_header_generation(buf);
3644 int was_dirty;
3645
3646#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3647
3648
3649
3650
3651
3652 if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &buf->bflags)))
3653 return;
3654#endif
3655 root = BTRFS_I(buf->pages[0]->mapping->host)->root;
3656 btrfs_assert_tree_locked(buf);
3657 if (transid != root->fs_info->generation)
3658 WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, "
3659 "found %llu running %llu\n",
3660 buf->start, transid, root->fs_info->generation);
3661 was_dirty = set_extent_buffer_dirty(buf);
3662 if (!was_dirty)
3663 __percpu_counter_add(&root->fs_info->dirty_metadata_bytes,
3664 buf->len,
3665 root->fs_info->dirty_metadata_batch);
3666}
3667
3668static void __btrfs_btree_balance_dirty(struct btrfs_root *root,
3669 int flush_delayed)
3670{
3671
3672
3673
3674
3675 int ret;
3676
3677 if (current->flags & PF_MEMALLOC)
3678 return;
3679
3680 if (flush_delayed)
3681 btrfs_balance_delayed_items(root);
3682
3683 ret = percpu_counter_compare(&root->fs_info->dirty_metadata_bytes,
3684 BTRFS_DIRTY_METADATA_THRESH);
3685 if (ret > 0) {
3686 balance_dirty_pages_ratelimited(
3687 root->fs_info->btree_inode->i_mapping);
3688 }
3689 return;
3690}
3691
3692void btrfs_btree_balance_dirty(struct btrfs_root *root)
3693{
3694 __btrfs_btree_balance_dirty(root, 1);
3695}
3696
3697void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root)
3698{
3699 __btrfs_btree_balance_dirty(root, 0);
3700}
3701
3702int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
3703{
3704 struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root;
3705 return btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
3706}
3707
3708static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
3709 int read_only)
3710{
3711
3712
3713
3714 return 0;
3715}
3716
3717static void btrfs_error_commit_super(struct btrfs_root *root)
3718{
3719 mutex_lock(&root->fs_info->cleaner_mutex);
3720 btrfs_run_delayed_iputs(root);
3721 mutex_unlock(&root->fs_info->cleaner_mutex);
3722
3723 down_write(&root->fs_info->cleanup_work_sem);
3724 up_write(&root->fs_info->cleanup_work_sem);
3725
3726
3727 btrfs_cleanup_transaction(root);
3728}
3729
3730static void btrfs_destroy_ordered_operations(struct btrfs_transaction *t,
3731 struct btrfs_root *root)
3732{
3733 struct btrfs_inode *btrfs_inode;
3734 struct list_head splice;
3735
3736 INIT_LIST_HEAD(&splice);
3737
3738 mutex_lock(&root->fs_info->ordered_operations_mutex);
3739 spin_lock(&root->fs_info->ordered_root_lock);
3740
3741 list_splice_init(&t->ordered_operations, &splice);
3742 while (!list_empty(&splice)) {
3743 btrfs_inode = list_entry(splice.next, struct btrfs_inode,
3744 ordered_operations);
3745
3746 list_del_init(&btrfs_inode->ordered_operations);
3747 spin_unlock(&root->fs_info->ordered_root_lock);
3748
3749 btrfs_invalidate_inodes(btrfs_inode->root);
3750
3751 spin_lock(&root->fs_info->ordered_root_lock);
3752 }
3753
3754 spin_unlock(&root->fs_info->ordered_root_lock);
3755 mutex_unlock(&root->fs_info->ordered_operations_mutex);
3756}
3757
3758static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
3759{
3760 struct btrfs_ordered_extent *ordered;
3761
3762 spin_lock(&root->ordered_extent_lock);
3763
3764
3765
3766
3767 list_for_each_entry(ordered, &root->ordered_extents,
3768 root_extent_list)
3769 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
3770 spin_unlock(&root->ordered_extent_lock);
3771}
3772
3773static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
3774{
3775 struct btrfs_root *root;
3776 struct list_head splice;
3777
3778 INIT_LIST_HEAD(&splice);
3779
3780 spin_lock(&fs_info->ordered_root_lock);
3781 list_splice_init(&fs_info->ordered_roots, &splice);
3782 while (!list_empty(&splice)) {
3783 root = list_first_entry(&splice, struct btrfs_root,
3784 ordered_root);
3785 list_move_tail(&root->ordered_root,
3786 &fs_info->ordered_roots);
3787
3788 btrfs_destroy_ordered_extents(root);
3789
3790 cond_resched_lock(&fs_info->ordered_root_lock);
3791 }
3792 spin_unlock(&fs_info->ordered_root_lock);
3793}
3794
3795static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
3796 struct btrfs_root *root)
3797{
3798 struct rb_node *node;
3799 struct btrfs_delayed_ref_root *delayed_refs;
3800 struct btrfs_delayed_ref_node *ref;
3801 int ret = 0;
3802
3803 delayed_refs = &trans->delayed_refs;
3804
3805 spin_lock(&delayed_refs->lock);
3806 if (delayed_refs->num_entries == 0) {
3807 spin_unlock(&delayed_refs->lock);
3808 printk(KERN_INFO "delayed_refs has NO entry\n");
3809 return ret;
3810 }
3811
3812 while ((node = rb_first(&delayed_refs->root)) != NULL) {
3813 struct btrfs_delayed_ref_head *head = NULL;
3814 bool pin_bytes = false;
3815
3816 ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
3817 atomic_set(&ref->refs, 1);
3818 if (btrfs_delayed_ref_is_head(ref)) {
3819
3820 head = btrfs_delayed_node_to_head(ref);
3821 if (!mutex_trylock(&head->mutex)) {
3822 atomic_inc(&ref->refs);
3823 spin_unlock(&delayed_refs->lock);
3824
3825
3826 mutex_lock(&head->mutex);
3827 mutex_unlock(&head->mutex);
3828 btrfs_put_delayed_ref(ref);
3829
3830 spin_lock(&delayed_refs->lock);
3831 continue;
3832 }
3833
3834 if (head->must_insert_reserved)
3835 pin_bytes = true;
3836 btrfs_free_delayed_extent_op(head->extent_op);
3837 delayed_refs->num_heads--;
3838 if (list_empty(&head->cluster))
3839 delayed_refs->num_heads_ready--;
3840 list_del_init(&head->cluster);
3841 }
3842
3843 ref->in_tree = 0;
3844 rb_erase(&ref->rb_node, &delayed_refs->root);
3845 delayed_refs->num_entries--;
3846 spin_unlock(&delayed_refs->lock);
3847 if (head) {
3848 if (pin_bytes)
3849 btrfs_pin_extent(root, ref->bytenr,
3850 ref->num_bytes, 1);
3851 mutex_unlock(&head->mutex);
3852 }
3853 btrfs_put_delayed_ref(ref);
3854
3855 cond_resched();
3856 spin_lock(&delayed_refs->lock);
3857 }
3858
3859 spin_unlock(&delayed_refs->lock);
3860
3861 return ret;
3862}
3863
3864static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
3865{
3866 struct btrfs_inode *btrfs_inode;
3867 struct list_head splice;
3868
3869 INIT_LIST_HEAD(&splice);
3870
3871 spin_lock(&root->delalloc_lock);
3872 list_splice_init(&root->delalloc_inodes, &splice);
3873
3874 while (!list_empty(&splice)) {
3875 btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
3876 delalloc_inodes);
3877
3878 list_del_init(&btrfs_inode->delalloc_inodes);
3879 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
3880 &btrfs_inode->runtime_flags);
3881 spin_unlock(&root->delalloc_lock);
3882
3883 btrfs_invalidate_inodes(btrfs_inode->root);
3884
3885 spin_lock(&root->delalloc_lock);
3886 }
3887
3888 spin_unlock(&root->delalloc_lock);
3889}
3890
3891static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
3892{
3893 struct btrfs_root *root;
3894 struct list_head splice;
3895
3896 INIT_LIST_HEAD(&splice);
3897
3898 spin_lock(&fs_info->delalloc_root_lock);
3899 list_splice_init(&fs_info->delalloc_roots, &splice);
3900 while (!list_empty(&splice)) {
3901 root = list_first_entry(&splice, struct btrfs_root,
3902 delalloc_root);
3903 list_del_init(&root->delalloc_root);
3904 root = btrfs_grab_fs_root(root);
3905 BUG_ON(!root);
3906 spin_unlock(&fs_info->delalloc_root_lock);
3907
3908 btrfs_destroy_delalloc_inodes(root);
3909 btrfs_put_fs_root(root);
3910
3911 spin_lock(&fs_info->delalloc_root_lock);
3912 }
3913 spin_unlock(&fs_info->delalloc_root_lock);
3914}
3915
3916static int btrfs_destroy_marked_extents(struct btrfs_root *root,
3917 struct extent_io_tree *dirty_pages,
3918 int mark)
3919{
3920 int ret;
3921 struct extent_buffer *eb;
3922 u64 start = 0;
3923 u64 end;
3924
3925 while (1) {
3926 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
3927 mark, NULL);
3928 if (ret)
3929 break;
3930
3931 clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS);
3932 while (start <= end) {
3933 eb = btrfs_find_tree_block(root, start,
3934 root->leafsize);
3935 start += root->leafsize;
3936 if (!eb)
3937 continue;
3938 wait_on_extent_buffer_writeback(eb);
3939
3940 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
3941 &eb->bflags))
3942 clear_extent_buffer_dirty(eb);
3943 free_extent_buffer_stale(eb);
3944 }
3945 }
3946
3947 return ret;
3948}
3949
3950static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
3951 struct extent_io_tree *pinned_extents)
3952{
3953 struct extent_io_tree *unpin;
3954 u64 start;
3955 u64 end;
3956 int ret;
3957 bool loop = true;
3958
3959 unpin = pinned_extents;
3960again:
3961 while (1) {
3962 ret = find_first_extent_bit(unpin, 0, &start, &end,
3963 EXTENT_DIRTY, NULL);
3964 if (ret)
3965 break;
3966
3967
3968 if (btrfs_test_opt(root, DISCARD))
3969 ret = btrfs_error_discard_extent(root, start,
3970 end + 1 - start,
3971 NULL);
3972
3973 clear_extent_dirty(unpin, start, end, GFP_NOFS);
3974 btrfs_error_unpin_extent_range(root, start, end);
3975 cond_resched();
3976 }
3977
3978 if (loop) {
3979 if (unpin == &root->fs_info->freed_extents[0])
3980 unpin = &root->fs_info->freed_extents[1];
3981 else
3982 unpin = &root->fs_info->freed_extents[0];
3983 loop = false;
3984 goto again;
3985 }
3986
3987 return 0;
3988}
3989
3990void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
3991 struct btrfs_root *root)
3992{
3993 btrfs_destroy_ordered_operations(cur_trans, root);
3994
3995 btrfs_destroy_delayed_refs(cur_trans, root);
3996
3997 cur_trans->state = TRANS_STATE_COMMIT_START;
3998 wake_up(&root->fs_info->transaction_blocked_wait);
3999
4000 cur_trans->state = TRANS_STATE_UNBLOCKED;
4001 wake_up(&root->fs_info->transaction_wait);
4002
4003 btrfs_destroy_delayed_inodes(root);
4004 btrfs_assert_delayed_root_empty(root);
4005
4006 btrfs_destroy_marked_extents(root, &cur_trans->dirty_pages,
4007 EXTENT_DIRTY);
4008 btrfs_destroy_pinned_extent(root,
4009 root->fs_info->pinned_extents);
4010
4011 cur_trans->state =TRANS_STATE_COMPLETED;
4012 wake_up(&cur_trans->commit_wait);
4013
4014
4015
4016
4017
4018}
4019
4020static int btrfs_cleanup_transaction(struct btrfs_root *root)
4021{
4022 struct btrfs_transaction *t;
4023
4024 mutex_lock(&root->fs_info->transaction_kthread_mutex);
4025
4026 spin_lock(&root->fs_info->trans_lock);
4027 while (!list_empty(&root->fs_info->trans_list)) {
4028 t = list_first_entry(&root->fs_info->trans_list,
4029 struct btrfs_transaction, list);
4030 if (t->state >= TRANS_STATE_COMMIT_START) {
4031 atomic_inc(&t->use_count);
4032 spin_unlock(&root->fs_info->trans_lock);
4033 btrfs_wait_for_commit(root, t->transid);
4034 btrfs_put_transaction(t);
4035 spin_lock(&root->fs_info->trans_lock);
4036 continue;
4037 }
4038 if (t == root->fs_info->running_transaction) {
4039 t->state = TRANS_STATE_COMMIT_DOING;
4040 spin_unlock(&root->fs_info->trans_lock);
4041
4042
4043
4044
4045 wait_event(t->writer_wait,
4046 atomic_read(&t->num_writers) == 0);
4047 } else {
4048 spin_unlock(&root->fs_info->trans_lock);
4049 }
4050 btrfs_cleanup_one_transaction(t, root);
4051
4052 spin_lock(&root->fs_info->trans_lock);
4053 if (t == root->fs_info->running_transaction)
4054 root->fs_info->running_transaction = NULL;
4055 list_del_init(&t->list);
4056 spin_unlock(&root->fs_info->trans_lock);
4057
4058 btrfs_put_transaction(t);
4059 trace_btrfs_transaction_commit(root);
4060 spin_lock(&root->fs_info->trans_lock);
4061 }
4062 spin_unlock(&root->fs_info->trans_lock);
4063 btrfs_destroy_all_ordered_extents(root->fs_info);
4064 btrfs_destroy_delayed_inodes(root);
4065 btrfs_assert_delayed_root_empty(root);
4066 btrfs_destroy_pinned_extent(root, root->fs_info->pinned_extents);
4067 btrfs_destroy_all_delalloc_inodes(root->fs_info);
4068 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
4069
4070 return 0;
4071}
4072
4073static struct extent_io_ops btree_extent_io_ops = {
4074 .readpage_end_io_hook = btree_readpage_end_io_hook,
4075 .readpage_io_failed_hook = btree_io_failed_hook,
4076 .submit_bio_hook = btree_submit_bio_hook,
4077
4078 .merge_bio_hook = btrfs_merge_bio_hook,
4079};
4080